deceptive fraudulent dishonest underhand deceitful duplicitous treacherous crafty disingenuous guileful bogus cheating counterfeit crooked cunning scheming sham sly sneaky untrustworthy bent dissembling false insincere lying perfidious shady sharp deceiving foxy hypocritical mendacious slippery subtle tricky unprincipled unscrupulous untruthful fast rogue shifty slim underhanded truthless bum catchy designing devious fake fishy indirect insidious mock oblique off phoney phony plausible pretended rascal roguish seeming serpentine slick snide spurious unreliable wily artful misleading dodgy dishonourable artificial dishonorable faithless feigned corrupt shrewd unethical smooth unctuous affected calculating double beguiling cagey astute conniving delusive backhanded traitorous knavish pseudo untrue unfaithful imitation disloyal disreputable dirty illegal