dishonest

Synonyms: backbiting bent bluffing cheating corrupt crafty crooked cunning deceitful deceiving deceptive designing disreputable double-crossing double-dealing elusive false fraudulent guileful hoodwinking mendacious misleading perfidious recreant shady shifty sinister slippery sneaking sneaky swindling traitorous treacherous tricky two-faced two-timing unctuous underhanded unfair unprincipled unscrupulous untrustworthy villainous wily

Antonyms: aboveboard ethical fair frank honest moral open principled scrupulous trustworthy truthful