5
sinister(adjective, corrupt, wicked, unreasonable, dishonest)
5
strange(adjective, wrong, rude, odd, incompatible)
5
titillating(adjective, society, sex, metters, indelicate)
5
uncomely(adjective, suitable, incorrect, unsuitable, unfitting)
5
undignified(adjective, rude, shocking, inappropriate, unbecoming)
5
unfavorable(adjective, bad, negative, inappropriate, unfortunate)
5
unfitted(adjective, useless, unfit)
5
ungodly(adjective, rude, vulgar, immoral, indecent)
5
unprofessional(adjective, wrong, immoral, unprincipled, unethical)
5
unscrupulous(adjective, wrong, corrupt, unreasonable, dishonest)
5
unusual(adjective, wrong, severe, harsh, exceptional)
5
villainous(adjective, wicked)
4
abominable
4
bizarre(adjective, strange, irregular, odd, inappropriate)
4
debauched(adjective, wicked)
4
degenerate(adjective, wicked)
4
depraved(adjective, wrong, wicked, immoral, unprincipled)
4
different(adjective, wrong, irregular, unsuitable, unqualified)
4
discordant(adjective, false, strange, suitable, inadequate)
4
disreputable(adjective, wrong, rude, inappropriate, unfit)
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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>