A four-character idiom (四字熟語) made of 不言 (not speaking) + 実行 (carrying out). It praises people who act quietly instead of making big declarations.
Common collocations
- 不言実行の人: a person who acts without talking
- 不言実行を心がける: to aim to act rather than talk
Similar words
- 有言実行: doing what one has said one will do — the modern counterpart that values declaring goals and then achieving them
- 言行一致: consistency between words and actions