frigidity vs frigidness

frigidity and frigidness both are nouns.

Word	Noun	Adjective	Verb	Adverb
frigidity	Yes	No	No	No
frigidness	Yes	No	No	No

As nouns, frigidity and frigidness are synonyms defined as:

Other synonyms of frigidity include chilliness, coldness, coolness, iciness.

As nouns, frigidity and frigidness are synonyms defined as:

frigidity and frigidness: sexual unresponsiveness (especially of women) and inability to achieve orgasm during intercourse

As nouns, frigidity and frigidness are synonyms defined as:

Other synonyms of frigidity include cold, coldness, low temperature.

frigidity (noun)	frigidness (noun)
a lack of affection or enthusiasm	a lack of affection or enthusiasm
sexual unresponsiveness (especially of women) and inability to achieve orgasm during intercourse	sexual unresponsiveness (especially of women) and inability to achieve orgasm during intercourse
the absence of heat	the absence of heat