The state in which fruits, people, or societies have fully developed into a completed state. A formal word used in forms like 「社会の成熟」「人格の成熟」「成熟した判断」, expressing the endpoint of development over time.
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N2斉唱せいしょう
The act of many people singing or reciting the same song or words in unison. A formal word used in forms like 「国歌斉唱」「校歌を斉唱する」 in official settings such as ceremonies or assemblies.
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N1, N2精神せいしん
The workings of the human mind and consciousness; the mental side as opposed to the body. 精神的に疲れる (mentally tired). Also means the idea at the root of something, as in チームの精神 (the team's spirit).
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N3成人せいじん
adult. To become an adult. Also, a person who has become an adult. In Japan, one becomes an adult from age 18.
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N3成績せいせき
The result of study, work, a match, etc. Example: 「成績が上がる」 (grades/results improve).
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N2ぜいたくぜいたく
The act of living extravagantly by spending money and goods beyond one's status or needs. Used in forms like 「ぜいたくな暮らし」「ぜいたくを言う」, referring to consumption beyond one's means or excessive demands.
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N3成長せいちょう
growth. For a person or living thing to grow and become bigger. Example: 「子どもの成長」 (a child's growth). Also used to mean an economy or company growing larger, as in 「経済成長」 (economic growth).
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N3青年せいねん
A young person around 20 years old. Especially often used for males. Example: 「青年時代」 (one's youth).
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N3政府せいふ
government. The organization that carries out the politics of a country. Example: 「日本政府」 (the Japanese government).
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N3制服せいふく
uniform. Clothing that is decided to be worn at a school, company, etc.
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N3生物せいぶつ
Living things overall, including animals and plants. When read 「なまもの」, it means food that has not been cooked.
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N3性別せいべつ
gender. The distinction between male and female. Example: 「性別を問わない」 (regardless of gender).
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N2, N3生命せいめい
Life. Often used in written language or set expressions such as 「生命保険」 (life insurance); in spoken language, 「命」 is normal.
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N2制約せいやく
A condition or rule that limits the scope of action or choice. A formal word used in forms like 「制約を受ける」「制約がある」「時間の制約」, referring to various restrictions of a physical, contractual, or temporal nature.
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N4西洋せいよう
Countries of Europe and America. The antonym is 「東洋」 (the East/Asia).
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N2, N3整理せいり
To neatly tidy up things that are scattered around. Example: 「机の上を整理する」 (to tidy up a desk). Also used to mean organizing thoughts or information in an understandable way, as in 「問題点を整理する」 (to organize the problem points).
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N3背負うせおう
The act of carrying something on one's back. The act of taking on responsibility, burden, or fate. Used in forms like 「荷物を背負う」「責任を背負う」, in both physical and metaphorical senses.
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N4世界せかい
world. The whole earth, all countries and people.
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N2急かすせかす
The act of urging someone to hurry up. Used in forms like 「子どもを急かす」「返事を急かす」, with the sense of pushing someone to speed up when they are acting calmly.
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N3せきせき
To forcefully expel breath from the throat. Example: 「せきが出る」 (to cough). Written with the kanji 「咳」, but since this kanji is not used in daily life, it is usually written in hiragana.
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N4席せき
seat. A place to sit. In the form 「〜席」 it is also used as a word for counting seats.
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N2積載せきさい
The act of loading cargo onto vehicles or ships. A formal word used in forms like 「積載量」「最大積載重量」, a technical and legal term referring to placing goods onto transport equipment.
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N3責任せきにん
responsibility. A duty one has taken on and must carry through. Example: 「責任がある」 (to bear responsibility). Also used to mean accepting the consequences of a failure, as in 「責任を取る」 (to take responsibility).
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N3石油せきゆ
petroleum. Oil extracted from underground. It becomes a raw material for fuel and plastics.
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N2世辞せじ
Words of praise spoken not from the heart but to please someone. Often used in the form 「お世辞」, a somewhat formal word referring to formal, social pleasantries.
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N2世相せそう
The overall state and trend of society in a given era. A formal word used in forms like 「世相を反映する」「世相を映す」, often appearing in public writing such as newspapers, editorials, or commentary.
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N2世俗せぞく
The ordinary, everyday world, as opposed to the religious or spiritual. A formal word used in forms like 「世俗を離れる」「世俗的な関心」, referring to mundane, secular matters.
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N3積極的せっきょくてき
A state of doing things on one's own initiative. Example: 「積極的に発言する」 (to speak up proactively). The antonym is 「消極的」 (passive).
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N2摂取せっしゅ
The act of taking nutrients, knowledge, or information into the body or mind. A formal word used in forms like 「栄養を摂取する」「情報を摂取する」, mainly referring to intentional intake for health or learning.
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N3絶対ぜったい
absolutely. No matter what, without fail. Example: 「絶対に行く」 (I will definitely go). When used with a negative form, it means "never," as in 「絶対にしない」 (I will never do it).
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N2絶体絶命ぜったいぜつめい
A situation in which one is utterly cornered with no means of escape. A four-character idiom. A formal word used in forms like 「絶体絶命のピンチ」「絶体絶命の状況」, emphasizing a critical situation.
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N4説明せつめい
To explain something in detail so it can be understood.
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N3節約せつやく
To reduce waste and use money or things carefully. Example: 「電気代を節約する」 (to save on electricity bills). The paired expression is 「むだづかい」 (wasteful spending).
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N4背中せなか
back. The back side of the body, from the waist to the shoulders.
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N2是非ぜひ
A judgment of whether something is good or bad, right or wrong. A formal word used in forms like 「是非を問う」「是非を論じる」. It shares its reading and characters with the adverb 「ぜひ」 (by all means) but differs in usage; here it is treated as a noun.
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N4背広せびろ
A set of jacket and trousers worn by men for work.
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N4線せん
line. A long, thin, continuous mark.
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N3全員ぜんいん
everyone. All the people present at that place or gathering. Example: 「全員が賛成した」 (everyone agreed).
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N2旋回せんかい
The act of turning in a circular path. Particularly refers to airplanes or birds tracing arcs in the air. A formal word used in forms like 「上空を旋回する」, applied to rotational motion in the air or above.
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N3選挙せんきょ
election. To choose a representative by voting. Example: 「選挙に行く」 (to go vote in an election).
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N2先行せんこう
Going ahead of others. Doing something before the scheduled time. A formal word used in forms like 「先行研究」「販売に先行する」「先行発売」, with the meaning of being positioned earlier in time or order.
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N2繊細せんさい
Delicate and keen in sense or feeling. Finely and elegantly made in object construction. A formal word used in forms like 「繊細な感性」「繊細な細工」, used for both human sensibilities and the construction of objects.
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N3洗剤せんざい
detergent. A chemical used for washing laundry or dishes to remove dirt.
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N3選手せんしゅ
A person chosen to compete in a competition. Often broadly used to refer to someone who plays sports in general. Example: 「野球選手」 (a baseball player).
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N3全身ぜんしん
The whole body. Example: 「全身がぬれる」 (to get soaked all over). Note the distinction from the homophone 「前進」 (moving forward).
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N2宣誓せんせい
The solemn vow in an official setting to tell the truth or to fulfill duties. A formal word used in forms like 「宣誓する」「選手宣誓」 in official contexts such as courts, ceremonies, or athletic competitions.
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N4全然ぜんぜん
Followed by a negative, an intensifying word meaning "not at all." Example: 「全然わからない」 (I don't understand at all).
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N3先祖せんぞ
ancestor. People from generations before oneself in a family line. Example: 「先祖の墓」 (an ancestor's grave). The antonym is 「子孫」 (descendants).
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N4戦争せんそう
war. Countries fighting each other using weapons.
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N3選択せんたく
choice. To choose among several options. Example: 「選択肢」 (a choice/option). Note the distinction from the homophone 「洗濯」 (doing laundry).
This word has different meanings and uses at each level
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