falsity n. + Add to list US //ˈfɔɫsəti// UK //fˈɒlsɪti// fal·si·ty SynonymsAntonymsEtymology Synonyms falsehoodfalsenessuntruth Antonyms truthOriginLATfalsus→LA-LATfalsitas→OFRfalseté→FRMfausseté→ENfalsity Corresponding to false + -ity. From Middle French fausseté, Old French falseté, from Late Latin falsitas, from Latin falsus.