underhand Synonyms

underarm underhanded underhandedly sneaky undercover stealthful sneaking sly slippery skulking shrewd shifty sharp shady secretive secret stealthy subreptitious unethical dishonourable two-faced duplicitous untrustworthy wily unscrupulous unprincipled unfair tricky treacherous surreptitious scheming perfidious deceptive deceiving deceitful cunning crooked crafty covert corrupt conscienceless conniving clandestine backstairs backdoor designing devious dishonest mendacious mealy-mouthed