Origin: Germanic Old English suffix
Sissiness has 2 different meanings across 1 category:
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"
The property of being sissy.