adjective

dishonest or unreliable.

a dodgy second-hand car salesman

dishonest,deceitful,not to be trusted,dubious,double-dealing,treacherous,traitorous,two-faced,unfaithful,duplicitous,dishonourable,unprincipled,unscrupulous,corrupt,underhand,unreliable,undependable,irresponsible,untrustworthy,iffy,shady,shifty,slippery,crooked,bent,shonky