sissiness n 1: 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" [syn: {effeminacy}, {effeminateness}, {sissiness}, {softness}, {womanishness}, {unmanliness}]