insipidity vs insipidness

insipidity and insipidness both are nouns.

Word	Noun	Adjective	Verb	Adverb
insipidity	Yes	No	No	No
insipidness	Yes	No	No	No

As nouns, insipidity and insipidness are synonyms defined as:

insipidity and insipidness: lacking any distinctive or interesting taste property

Other synonyms of insipidity include blandness.

As nouns, insipidity and insipidness are synonyms defined as:

insipidity and insipidness: extreme dullness; lacking spirit or interest

Other synonyms of insipidity include boringness, dreariness.

insipidity (noun)	insipidness (noun)
lacking any distinctive or interesting taste property	lacking any distinctive or interesting taste property
extreme dullness; lacking spirit or interest	extreme dullness; lacking spirit or interest