6
unwise
6
wrongful(adjective, evil, rude, vulgar, dishonest)
5
awkward(adjective, dull, flat, slow, suitable)
5
deviant(adjective, wrong, unacceptable, nonconforming)
5
dishonourable
5
evil
5
excessive(adjective, extreme, senseless, unwarranted, iniquitous)
5
fallacious(adjective, wrong, fake, counterfeit, dishonest)
5
impertinent(adjective, disrespectful)
5
imprecise(adjective, wrong, false, unsound, untrue)
5
in bad taste(expression, adjective, idiom, offensive, rude)
5
inconsistent(adjective, strange, odd, inappropriate, incompatible)
5
inexact(adjective, wrong, fake, false, counterfeit)
5
irrelevant(adjective, wrong, disagreement, suitable, unreasonable)
5
licentious(adjective, blue, nasty, offensive, rude)
5
odd(adjective, wrong, strange, suitable, unsuitable)
5
out of keeping(expression, adjective, idiom, rude, irregular)
5
out of line(expression, adjective, idiom, wrong, suitable)
5
outlandish(adjective, rough, offensive, rude, foolish)
5
peculiar(adjective, wrong, unacceptable, nonconforming)
10 years ago|39k views|share |citing 
APASmart Define. (2016). improper thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/improper/thesaurus/synonyms
ChicagoSmart Define. 2016. "improper thesaurus" https://smartdefine.org/improper/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, improper thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/improper/thesaurus/synonyms>.
MLASmart Define. "improper thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/improper/thesaurus/synonyms>