unmanliness vs sissiness

unmanliness and sissiness both are nouns.

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

As nouns, unmanliness and sissiness are synonyms defined as:

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

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

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