Synonyms for improper

Adjective

1. improper (vs. proper), inappropriate, incorrect, wrong, indecent, indecorous, unbecoming, uncomely, unseemly, untoward, out-of-the-way, wrong, inappropriate, incorrect#1, wrong, indecent, indecorous#1, indelicate, unfit, wrong

usage: not suitable or right or appropriate; "slightly improper to dine alone with a married man"; "improper medication"

2. improper, unconventional, unlawful, irregular (vs. regular)

usage: not conforming to legality, moral law, or social convention; "an unconventional marriage"; "improper banking practices"

3. unsuitable, improper, wrong, inappropriate (vs. appropriate)

usage: not appropriate for a purpose or occasion; "unsuitable attire for the office"; "said all the wrong things"