8
mistaken(verb, adjective, wrong, fake, counterfeit)
8
nasty(adjective, bad, hard, tough, blue)
8
raunchy(adjective, dull, blue, rough, nasty)
8
reprehensible(adjective, rude, wicked, shocking, indecent)
8
shameful(adjective, unreasonable, dishonest, inappropriate, indecent)
8
undue(adjective, wrong, suitable, inappropriate, excessive)
8
unreasonable(adjective, wrong, excessive, unwarranted, unacceptable)
8
unseasonable(adjective, wrong, disagreement, suitable, inappropriate)
8
untrue(adjective, wrong, fake, false, counterfeit)
8
unwarranted(adjective, suitable, unreasonable, extreme, senseless)
7
base(adjective, bad, nasty, offensive, rude)
7
blameworthy(adjective, wicked, unreasonable, unwarranted, prejudiced)
7
corrupt(adjective, bad, wrong, rough, rude)
7
disgraceful(adjective, corrupt, dishonest, unfit, worthless)
7
ill-advised(adjective, negative, suitable, unsuitable, unfitting)
7
illegitimate(adjective, unreasonable, dishonest, extreme, stiff)
7
illicit(adjective, dishonest, legal, illegal, illegitimate)
7
impure(adjective, dull, blue, rough, nasty)
7
inept(adjective, dull, agree, wrong, flat)
7
objectionable(adjective, wrong, offensive, terrible, negative)
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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>