shifty

Synonyms: cagey collusive conniving contriving crafty crooked cunning devious dishonest dodging duplicitous elusive equivocating evasive flyby-night foxy fraudulent furtive insidious lying mendacious prevaricative prevaricatory roguish scheming shady shrewd shuffling slick slimy slippery sly sneaky treacherous tricky underhand unhonest unprincipled untruthful wily

Antonyms: forthright frank honest trustworthy