Under-handed is a word that connotes dishonesty or deceitful behavior. On the contrary, some of its antonyms are virtuous, ethical, honest, sincere, trustworthy, fair, forthright, and upright. Virtuous means having high moral standards, and ethical means conforming to accepted morals or standards. Honest refers to being truthful, while sincere means genuine and heartfelt. Trustworthy means capable of being relied on, while fair refers to being impartial and just. Forthright implies frankness and straightforwardness, while upright refers to being upright in character and conduct. Using antonyms for under-handed can help us write and communicate more effectively, conveying the intended message accurately.