underhanded adjective 5adverb 1noun 1forms 2 adjective5 •Done by moving the hand (and arm) from below.Golf is an underhanded game, because we must swing the club in an underhanded motion in order to play the ball off the ground. — 2011 •Sly, dishonest, corrupt, cheating.His underhanded trick backfired and he was disqualified. •Secret; surreptitious.And, although the mystery of an unsigned note rather thrilled her, it seemed underhanded. And June hated underhanded things. — 1903 •Insincere; sarcastic.An underhanded compliment is actually criticism. •Understaffed.Jude and me can make out to work the boat and get a livin', but we're too underhanded for a big job. — 2008 adverb1 •In an underhanded manner.Bonino required each of us to shoot our free throws underhanded. — 2009 noun[plural only]1 •Devious people, collectively.We have fallen to the underhanded and label it a greater means. — 2002 formsmore underhanded · most underhanded