妥当(だとう) だとう na-adjective, noun proper, appropriate, valid 1. proper, appropriate, reasonable, valid Something that is fitting, suitable, or acceptable given the circumstances. Often used to describe decisions, prices, or judgments. この価格(かかく)は妥当(だとう)だと思(おも)う。 I think this price is reasonable. 妥当(だとう)な判断(はんだん)を下(くだ)してください。 Please make an appropriate judgment. その結論(けつろん)の妥当(だとう)性(せい)を検証(けんしょう)する必要(ひつよう)がある。 We need to verify the validity of that conclusion. 妥当性 = validity, appropriateness USAGE: 妥当(だとう) is used to describe something as reasonable, proper, or valid. It's commonly used in formal and business contexts.COMMON PATTERNS:妥当(だとう)な + noun (appropriate ~)妥当(だとう)だ/である (is appropriate)妥当(だとう)性(せい) (validity, appropriateness - noun form)COMMON COLLOCATIONS:妥当(だとう)な価格(かかく) (reasonable price)妥当(だとう)な判断(はんだん) (appropriate judgment)妥当(だとう)な結論(けつろん) (valid conclusion)妥当(だとう)性(せい)を検討(けんとう)する (to consider validity)SIMILAR WORDS:適切(てきせつ) (appropriate, suitable)適当(てきとう) (suitable; also: half-hearted, sloppy) Related Words Synonym: 適切(てきせつ) (appropriate, suitable) Contrast: 適当(てきとう) (suitable; half-hearted) general Added 2026.1.13 20:35 · Revised 2026.5.29 23:12 04000/04053_datou