Genuine, a. — Webster enters it under “genuine”
Etymology: [L. genuinus, fr. genere, gignere, to beget, in pass., to be born: cf. F. génuine. See Gender.]
Belonging to, or proceeding from, the original stock; native; hence, not counterfeit, spurious, false, or adulterated; authentic; real; natural; true; pure; as, a genuine text; a genuine production; genuine materials. "True, genuine night." Dryden.
Syn. -- Authentic; real; true; pure; unalloyed; unadulterated. See Authentic. -- Gen"u*ine*ly, adv. -- Gen"u*ine*ness, n. The evidence, both internal and external, against the genuineness of these letters, is overwhelming. Macaulay.
Shades of meaning
Fernald lists genuineness only as an antonym, under hypocrisy.
He lists it without comment; the entries above explain its neighbors.