Added 10 October 2026 underhandedly adverb Categories: Describing WordsObscure Words adverb ! Definition from WordNet 3.1, Princeton University. More about underhandedly at Wordnik → Where our words come from → Slyly and secretly. Mean revenge, committed underhand Related Words: underhandunderhandlyunder-handedlyunder-handedundeviouslybackhandedlybackhandedsneakilyundeceptivelysneakishlyundiscreetlyindiscreetly Back to today's word