Definition: not appropriate for a purpose or occasion
Usage: said all the wrong things
Main entry: improper
Definition: not suitable or right or appropriate
Usage: slightly improper to dine alone with a married man; improper medication; improper attire for the golf course
Main entry: unconventional, unlawful, improper
Definition: not conforming to legality, moral law, or social convention
Usage: an unconventional marriage; improper banking practices