(adjective, verb)


1. not suitable or right or appropriate

- slightly improper to dine alone with a married man

- improper medication

- improper attire for the golf course

Similar word(s): inappropriate, indecent, indecorous, indelicate, unfit, indecent, indecorous, unbecoming, uncomely, unseemly, untoward, incorrect, wrong, wrong

2. not conforming to legality, moral law, or social convention

- improper banking practices

Similar word(s): irregular, unconventional, unlawful

3. not appropriate for a purpose or occasion

Similar word(s): inappropriate, wrong


1. (obsolete, transitive) To appropriate; to limit.

2. (obsolete) To behave improperly