不必要(ふひつよう) ふひつよう na-adjective unnecessary 1. unnecessary, unneeded, not required Not necessary or required. The negation of 必要(ひつよう) (necessary). Used to describe things that can be omitted or are not essential. 不必要(ふひつよう)な出費(しゅっぴ)は避(さ)けたい。 I want to avoid unnecessary expenses. その説明(せつめい)は不必要(ふひつよう)だと思(おも)います。 I think that explanation is unnecessary. 不必要(ふひつよう)な心配(しんぱい)はしないでください。 Please don't worry unnecessarily. Na-adjective formed by adding the negative prefix 不(ふ) to 必要(ひつよう) (necessary).FORMS:不必要(ふひつよう)な + noun (不必要(ふひつよう)な物(もの) = unnecessary things)不必要(ふひつよう)に + verb (不必要(ふひつよう)に心配(しんぱい)する = worry unnecessarily)SIMILAR WORDS:不要(ふよう) - unneeded (more common in compounds)無駄(むだ) - wasteful, uselessいらない - don't need (casual) Related Words Antonym: 必要(ひつよう) (necessary) Synonym: 不要(ふよう) (unneeded) general Added 2026.1.11 21:45 · Revised 2026.3.24 9:27 02000/02481_fuhitsuyou