Sissiness definitions

noun

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"

See also: effeminacy effeminateness softness womanishness unmanliness