senselessness vs inanity

senselessness and inanity both are nouns.

Word	Noun	Adjective	Verb	Adverb
senselessness	Yes	No	No	No
inanity	Yes	No	No	No

As nouns, senselessness and inanity are synonyms defined as:

Other synonyms of senselessness include mindlessness, pointlessness, vacuity.

senselessness (noun)	inanity (noun)
total lack of meaning or ideas	total lack of meaning or ideas