sissiness vs unmanliness

sissiness and unmanliness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sissiness	Yes	No	No	No
unmanliness	Yes	No	No	No

As nouns, sissiness and unmanliness are synonyms defined as:

sissiness and unmanliness: the trait of being effeminate (derogatory of a man)

Other synonyms of sissiness include effeminacy, effeminateness, softness, womanishness.

sissiness (noun)	unmanliness (noun)
the trait of being effeminate (derogatory of a man)	the trait of being effeminate (derogatory of a man)