We found one dictionary that defines the word sissyism:

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1. sissyism: Wiktionary

Definitions from Wiktionary (sissyism) ▸ noun:  The quality of being a sissy. ▸ Words similar to sissyism ▸ Usage examples for sissyism ▸ Idioms related to sissyism ▸ Wikipedia articles (New!) ▸ Popular adjectives describing sissyism ▸ Words that often appear near sissyism ▸ Rhymes of sissyism ▸ Invented words related to sissyism