genuineness genuinely • genus · · · Info · Definitions · Synonyms · Antonyms · Characters · · genuineness · · Text Latin · · Script 11 · · Length Definitions · · · (noun) the state of being genuine. · · Noun Definition 1 (noun) undisputed credibility. Synonyms: authenticity, legitimacy. · · Noun Definition 2 Synonyms · · · authenticity · · Synonym 1 legitimacy · · Synonym 2 Antonyms · · · spuriousness · · Antonym 0 Characters · · e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E s latin small letter s U+0073 u latin small letter u U+0075