Synonyms of unethical

1 Syllable

fake, slick, sharp, wrong, scam

2 Syllables

crooked, yellow, impious, unfair, wrongful, venal, buyable, corrupt, flimflam, cheating, dirty, fishy, wicked, shady, sneaky

3 Syllables

improper, immoral, unrightful, lubricious, two-faced, two-timing, unsporting, yellower, nonexpert, bribable, slippery, fly-by-night, unrighteous, yellowest, illegal, underhand

4 Syllables

unscrupulous, unprincipled, money-grubbing, corruptible, mercenary, dirty-dealing, moneygrubbing, conscienceless, unconscientious, double-crossing, profiteering

5 Syllables

disreputable, inequitable, dishonorable, unconscionable, unequitable, unprofessional, exploitative