SISSY
effeminate, emasculate, epicene, cissy, sissified, sissyish, sissy
(adjective) having unsuitable feminine qualities
sissy, pantywaist, pansy, milksop, Milquetoast
(noun) a timid man or boy considered childish or unassertive
Source: WordNet® 3.1
Proper noun
Sissy
A diminutive of the female given name Cecilia.
Etymology 1
Noun
sissy (plural sissies)
(pejorative, colloquial) An effeminate boy or man.
(pejorative, colloquial) A timid, unassertive or cowardly person.
(BDSM) A male crossdresser who adopts feminine behaviours.
(colloquial) Sister.
Synonyms
• (effeminate man or boy): cot-quean (obsolete), janegirl (“effeminate boy”) (rare); see also effeminate man
• (timid or cowardly person): milquetoast, nancy, quiche-eater; see also milksop
• (sister): sis
Antonyms
• non-sissy
• unsissy
Adjective
sissy (comparative sissier, superlative sissiest)
(pejorative) Effeminate.
(pejorative) Cowardly.
Etymology 2
Noun
sissy (uncountable)
(childish, colloquial) Urination; urine.
Verb
sissy (third-person singular simple present sissies, present participle sissying, simple past and past participle sissied)
(childish, colloquial) To urinate.
Source: Wiktionary