10
underhand(adjective, mean, bad, smooth, wrong)
10
base(noun, adjective, mean, evil, corrupt)
10
foul(adjective, mean, nasty, base, dirty)
10
sharp(adjective, mean, smooth, wrong, dishonest)
10
unfair(adjective, bad, wrong, false, corrupt)
10
venal(adjective, mean, base, corrupt, dishonest)
9
knavish(adjective, hard, evil, rough, nasty)
9
shameless(adjective, hard, evil, rough, nasty)
9
cunning(adjective, mean, smooth, smart, false)
9
dirty(adjective, bad, hard, wrong, rough)
9
dishonorable(adjective, mean, bad, hard, smooth)
9
false(adjective, mean, base, dishonest, deceitful)
9
fraudulent(adjective, false, corrupt, dishonest, immoral)
9
shifty(adjective, mean, smooth, smart, false)
9
untrustworthy(adjective, mean, bad, base, false)
9
villainous(adjective, mean, bad, evil, base)
8
dishonourable
8
cheating(adjective, bad, wrong, false, corrupt)
8
criminal(adjective, evil, corrupt, wicked, unreasonable)
8
faithless(adjective, mean, base, dishonest, immoral)
10 years ago|19k views|share |citing 
APASmart Define. (2016). unscrupulous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unscrupulous/thesaurus/synonyms
ChicagoSmart Define. 2016. "unscrupulous thesaurus" https://smartdefine.org/unscrupulous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unscrupulous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unscrupulous/thesaurus/synonyms>.
MLASmart Define. "unscrupulous thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/unscrupulous/thesaurus/synonyms>