The term 'not aboveboard' is used to describe activities that are not honest or legal. The crossword solutions for this term include 'SHADY' (5 letters), 'CROOKED' (7 letters), 'SLY' (3 letters), 'CLANDESTINE' (11 letters), 'SURREPTITIOUS' (13 letters), 'underthetable' (13 letters), and 'underthecounter' (15 letters). These words all imply that the activity is being done in a secretive or deceptive manner, and that it is not open or honest.