EXAMPLES FROM THE WEB FOR SISSINESS
It was fun for them, besides they felt it would be a service to knock out some of the Boston "sissiness."
1846, "sister," extended form of sis (q.v.). Meaning "effeminate man" is recorded from 1887; the adjective in this sense is from 1891. Related: Sissiness. Sissy bar is recorded from 1969.