〜のみならず

Meaning

Indicates that something is not limited to one thing but extends over a wider range. A formal, literary equivalent of 「〜だけでなく」 (not only), adding the latter element to the former to show that the scope or degree expands further.

Examples

この薬は頭痛のみならず、肩こりにも効く This medicine is effective not only for headaches but also for stiff shoulders.
彼は学者としてのみならず、教育者としても優れている He is outstanding not only as a scholar but also as an educator.
事故は当事者のみならず、地域全体に影響を与えた The accident affected not only those directly involved but the entire community.