unhonest

cagey crafty shrewd slippery sneaky tricky wily

collusive conniving contriving crooked cunning devious dishonest dodging duplicitous elusive equivocating evasive fly-by-night foxy fraudulent furtive insidious lying mendacious prevaricative prevaricatory roguish scheming shady shuffling slick slimy sly treacherous underhand unprincipled untruthful

aboveboard frank honest naive

forthright trustworthy