What's the adjective for sissiness? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs sissy and sissify which may be used as adjectives within certain contexts.
“She wanted him to become both an athlete and a successful scholar, and was disappointed with what she called his sissyish behavior.”
“While he was fond of the theatre, he was wary of music as bordering on the sissyish.”
“Born in Ohio, he had an uneven boyhood, curiously dyslexic yet smart, sissyish in team sports but very competent athletically in individual competition.”