tenuity vs feebleness

tenuity and feebleness both are nouns.

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

As nouns, tenuity and feebleness are synonyms defined as:

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