A river overflowing due to heavy rain or the like, leaving the land flooded. Also used figuratively, as in 「情報の洪水」.
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N1傲然ごうぜん
「傲」 means to be arrogant and to look down on others. It describes an attitude of acting haughtily and looking down on those around. Used in expressions like 「傲然と言い放つ」 or 「傲然たる態度」, it is a formal word expressing strong arrogance.
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N3高速こうそく
high speed. Being very fast in speed. Example: 「高速で移動する」 (to move at high speed). Also commonly used as a shortened form of 「高速道路」 (expressway), as in 「高速に乗る」 (to get on the expressway).
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N1豪胆ごうたん
「豪」 means strong and vigorous, and 「胆」 originally refers to the gallbladder, an internal organ, and is used as a metaphor for courage. It describes a character that has nerve and is rarely shaken by anything. Used in expressions like 「豪胆な人物」 or 「豪胆にふるまう」, it is a formal word expressing a brave and firmly resolved character.
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N4校長こうちょう
principal. The highest-ranking person at a school. Oversees the entire school.
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N4交通こうつう
Movement of people and things by car, train, airplane, etc. Example: 「交通がべんりなまち」 (a town with convenient transportation).
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N1拘泥こうでい
「拘」 means to hold or detain, and 「泥」 originally means to be stuck in mud and unable to move, from which it came to mean to cling. It refers to being caught up in trivial details and unable to move forward. Used in expressions like 「形式に拘泥する」 or 「過去に拘泥する」, it is a formal word for criticizing an inflexible attitude.
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N3行動こうどう
action. To actually move one's body and do something. Example: 「行動を起こす」 (to take action), 「行動力」 (the ability to take action).
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N3強盗ごうとう
robbery. To threaten someone and steal their money or belongings. The person who commits this crime. Example: 「銀行強盗」 (a bank robbery), 「強盗に入られる」 (to be robbed by an intruder).
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N4講堂こうどう
auditorium. A room at a school, etc., where many people gather for ceremonies and events.
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N3購入こうにゅう
To buy something. A slightly more formal way of saying 「買う」 (to buy).
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N1荒廃こうはい
For land or a building to fall into ruin and become desolate. It is also used to mean that a person's heart becomes desolate and loses its warmth.
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N1業腹ごうはら
「業」 is a Buddhist term meaning intense anger and irritation, and 「腹」 means the belly, used as a metaphor for the place where feelings of anger build up. It refers to being so angry that one cannot bear it. Used in expressions like 「業腹だ」 or 「業腹でならない」, it is an archaic and formal word expressing strong anger or chagrin.
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N3幸福こうふく
happiness. Being fulfilled and happy. Example: 「幸福な家庭」 (a happy family). A more formal word than 「幸せ」. The antonym is 「不幸」 (unhappiness).
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N3興奮こうふん
A state in which one's feelings are heightened and the heart cannot settle down.
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N1傲慢ごうまん
「傲」 means arrogant, and 「慢」 means to belittle; the word combines two synonymous characters. It refers to the attitude of believing oneself to be the best and looking down on others. Used in expressions like 「傲慢な態度」 or 「傲慢にふるまう」, it is a formal word used to strongly criticize a person's character or attitude.
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N4公務員こうむいん
civil servant. A person who does work for the country or town, such as at a city hall.
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N3効率こうりつ
The ratio of results achieved relative to the time or effort spent. 「効率がいい」 means little is wasted.
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N3越えるこえる
To go over to the other side of a mountain, river, border, etc. Example: 「国境を越える」 (to cross a border), 「峠を越える」 (to go over a mountain pass). The homophone 「超える」 refers to a quantity or limit being exceeded, as in 「1万人を超える」 (to exceed 10,000 people), and is written differently.
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N3凍るこおる
freeze. For water, etc., to cool and solidify. Example: 「湖が凍る」 (a lake freezes), 「道路が凍る」 (a road freezes over).
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N3誤解ごかい
misunderstanding. To mistakenly take in the meaning or feeling of something. Example: 「誤解を招く」 (to invite misunderstanding), 「誤解を解く」 (to clear up a misunderstanding).
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N3語学ごがく
To study a foreign language. Example: 「語学が得意だ」 (good at languages), 「語学学校」 (a language school).
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N1枯渇こかつ
「枯」 means for plants to wither, and 「渇」 means for water to dry up; both characters describe natural phenomena of drying up. From this, the word came to be used metaphorically for water, resources, money, or ideas being exhausted to the bottom. Used in expressions like 「資源の枯渇」 or 「資金が枯渇する」, it is a formal word used in contexts where something necessary runs out.
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N3呼吸こきゅう
breathing. To breathe in and out. Example: 「深く呼吸する」 (to breathe deeply). Also used to mean being in sync with someone, as in 「呼吸が合う」 (to be in rhythm with each other).
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N1極悪ごくあく
「極」 means utmost, and 「悪」 means bad; together they mean bad to the utmost. It refers to being bad beyond all measure. Used in expressions like 「極悪非道」 or 「極悪人」, it is a formal word for situations of strongly condemning crimes or cruel acts.
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N1極意ごくい
「極」 means to reach the extreme, and 「意」 means heart or insight; together they refer to the insight at the state of utmost mastery. It refers to the most important and profound insight in learning, the arts, or martial arts. Used in expressions like 「極意を授ける」 or 「極意をきわめる」, it expresses the essence obtained through long years of training.
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N2, N4国際こくさい
Something between countries. It is always attached to the front of another word, and 「国際」 alone never stands in a sentence. A plane that flies between countries is a 「国際線(こくさいせん)」, and ties between countries are 「国際関係(こくさいかんけい)」; there are also 「国際けっこん」 and 「国際くうこう」. In the form 「国際的(こくさいてき)」 it becomes a word that describes what something is like, as in 「国際的にゆうめいな店」.
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N1酷似こくじ
「酷」 means severe, and 「似」 means to resemble; together they mean to resemble severely. It refers to appearance or content being so similar that they cannot be told apart. Used in expressions like 「酷似している」 or 「Aに酷似する」, it is a formal word for situations of mentioning a coincidental resemblance or a suspicion of imitation.
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N1酷使こくし
「酷」 means cruel or severe, and 「使」 means to use; together they mean to use harshly. It refers to continuously using a person or thing intensely beyond reasonable limits. Used in expressions like 「目を酷使する」 or 「労働者を酷使する」, in situations of imposing excessive burden.
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N3国籍こくせき
nationality. The status of which country a person is a citizen of. Example: 「日本国籍」 (Japanese nationality), 「国籍を取得する」 (to acquire nationality).
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N1告訴こくそ
It refers to the victim of a crime requesting the prosecutor or police to punish the perpetrator. Used in expressions like 「告訴する」 or 「告訴を取り下げる」, it is a word used as a legal procedure.
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N3国立こくりつ
Being built with the nation's money and run by the nation. It is most often attached to the name of a facility, as in 「国立大学」 (a national university), 「国立公園」 (a national park), 「国立博物館」 (a national museum), 「国立図書館」 (a national library), 「国立競技場」 (a national stadium). It is also used alone, as in 「この大学は国立だ」. Used in contrast with 「私立」 (private), 「県立」 (prefectural), and 「市立」 (municipal).
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N1孤軍こぐん
「孤」 means alone and 「軍」 means army; the original meaning refers to a single unit left isolated without support from allies. From this, the word came to describe a unit or individual fighting in isolation. It is a formal term that expresses facing difficulty alone, used almost exclusively as a set phrase such as 「孤軍奮闘する」.
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N3焦げるこげる
burn. To become blackened from being overcooked. Example: 「パンが焦げる」 (bread burns), 「焦げたにおい」 (a burnt smell). Something turning black on its own is 「焦げる」, while a person making it turn black by overcooking it is 「焦がす」; they are used as in 「ごはんが焦げる」 versus 「ごはんを焦がす」.
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N1孤高ここう
「孤」 means alone, and 「高」 means a lofty state; together they mean maintaining a lofty state by oneself. It refers to keeping high ideals or position alone, without conforming to others. Used in expressions like 「孤高の人」 or 「孤高を保つ」, it is a somewhat archaic and formal word expressing independent nobility.
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N3凍えるこごえる
For the body to lose sensation from cold. Example: 「手が凍える」 (one's hands go numb from cold), 「凍えるような寒さ」 (bone-chilling cold).
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N4心こころ
heart. The thing inside a person that feels happiness, sadness, etc. Also used to mean a way of thinking, as in 「心がひろい」 (broad-minded).
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N3試みこころみ
attempt. To try doing something. Example: 「新しい試み」 (a new attempt/initiative). The verb form is 「試みる」.
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N3腰こし
waist. The bendable part of the body below the back. Example: 「腰が痛い」 (one's lower back hurts). There are also the expressions 「腰が低い」 (having a humble/polite manner) and 「腰を下ろす」 (to sit down).
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N1固執こしつ
「固」 means firmly, and 「執」 means to grasp or cling; together they mean to cling firmly. It refers to stubbornly not changing one's opinion or thoughts. Used in expressions like 「自説に固執する」 or 「過去に固執する」, in contexts that critically describe a lack of flexibility.
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N1こじつけこじつけ
It refers to forcibly connecting things that originally have no relation by attaching some reasoning. Used in expressions like 「こじつけにすぎない」 or 「こじつけの解釈」, it is a noun used in situations of criticizing forced association.
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N4故障こしょう
For a machine or tool to break and stop working. Example: 「くるまが故障する」 (a car breaks down).
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N3個人こじん
individual. Each single person, as opposed to a group. Example: 「個人の意見」 (an individual's opinion), 「個人的な問題」 (a personal matter), 「個人情報」 (personal information).
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N3越すこす
To pass a place or time and go to the other side. Example: 「年を越す」 (to see out the year/into the new year), 「冬を越す」 (to get through the winter), 「引っ越す」 (to move house). In the form 「お越しください」, it also serves as an honorific way of saying 「来る」 (to come).
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N1, N2擦るこする
To press something firmly against the surface of an object and move it. A different action from 「摩る」 (to stroke gently) or 「刷る」 (to print), which are also read 「する」.
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N1誇大こだい
「誇」 means to boast, and 「大」 means large; together they mean to make something appear larger by boasting. It refers to saying or showing something as larger than it actually is. Used in expressions like 「誇大広告」 or 「誇大に表現する」, in contexts that criticize expressions inflated beyond reality.
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N1誇大妄想こだいもうそう
「誇大」 means exaggerated and inflated, and 「妄想」 means imagining without basis in fact; together they mean imagining oneself as larger than one really is. It refers to thinking of one's ability or position as far greater than reality, divorced from facts. Used in expressions like 「誇大妄想に陥る」, it is a four-character idiom used to criticize excessive self-evaluation.
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N3国家こっか
nation. A country. A unified entity that has territory, people, and a government. Example: 「国家試験」 (a national examination). More formal than 「国」, used when discussing politics and law.
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N3国会こっかい
The most important assembly, which decides a nation's laws and budget. Example: 「国会議員」 (a member of parliament), 「国会で審議する」 (to deliberate in the National Diet).
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N1滑稽こっけい
To be so absurd that it is funny enough to make one laugh without meaning to.
This word has different meanings and uses at each level
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