insipidness vs boringness

insipidness and boringness both are nouns.

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

As nouns, insipidness and boringness are synonyms defined as:

insipidness and boringness: extreme dullness; lacking spirit or interest

Other synonyms of insipidness include dreariness, insipidity.

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