legitimacy 7 antonyms and opposites of legitimacy. Noun — The state of being lawful, valid, or generally accepted as proper. Synonyms for legitimacy legitimateness allowability allowableness liceity legitness permissibility permissibleness validity validness Antonyms for legitimacy illegitimacy illegitimateness invalidity invalidness nonlegitimacy nonvalidity unvalidity ← Back to the full definition of legitimacy
