feebleness vs tenuity

feebleness and tenuity both are nouns.

Word	Noun	Adjective	Verb	Adverb
feebleness	Yes	No	No	No
tenuity	Yes	No	No	No

As nouns, feebleness and tenuity are synonyms defined as:

feebleness (noun)	tenuity (noun)
the quality of lacking intensity or substance	a rarified quality
the state of being weak in health or body (especially from old age)	the quality of lacking intensity or substance
	relatively small dimension through an object as opposed to its length or width