not suitable or right or appropriate; "slightly improper to dine alone with a married man"; "improper medication"; "improper attire for the golf course"適当でない、正しくない、または、適切でない不適当
例:slightly improper to dine alone with a married man 単独で妻帯者と食事をするのは、やや不適切である
not appropriate for a purpose or occasion; "said all the wrong things"目的か場合に適切でない不適当
not conforming to legality, moral law, or social convention; "an unconventional marriage"; "improper banking practices"合法性、道徳律または社会的な慣例に従わないさま不正