sissiness(n = noun.attribute) effeminacy, effeminateness, softness, unmanliness, womanishness - the trait of being effeminate (derogatory of a man); "the students associated science with masculinity and arts with effeminacy"; "Spartans accused Athenians of effeminateness"; "he was shocked by the softness of the atmosphere surrounding the young prince, arising from the superfluity of the femininity that guided him"