insipidness vs dreariness

insipidness and dreariness both are nouns.

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

As nouns, insipidness and dreariness are synonyms defined as:

insipidness and dreariness: extreme dullness; lacking spirit or interest

Other synonyms of insipidness include boringness, insipidity.

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