dreariness vs insipidness

dreariness and insipidness both are nouns.

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

As nouns, dreariness and insipidness are synonyms defined as:

dreariness and insipidness: extreme dullness; lacking spirit or interest

Other synonyms of dreariness include boringness, insipidity.

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