Synonyms for improper

Similarity of adj improper

3 senses of improper

Sense 1:

improper (vs. proper)
indecent, indecorous, unbecoming, uncomely, unseemly, untowardout-of-the-waywrong, incorrect

Also See: inappropriate#1; indecent#2; indecorous#1, indelicate#2; unfit#1; wrong#2

Sense 2:

improper, unconventional, unlawful
irregular (vs. regular)

Sense 3:

improper, wrong
inappropriate (vs. appropriate)