weakly vs decrepit

weakly and decrepit both are adjectives.

Word	Noun	Adjective	Verb	Adverb
weakly	No	Yes	No	Yes
decrepit	No	Yes	No	No

As adjectives, weakly and decrepit are synonyms defined as:

Other synonyms of weakly include debile, feeble, infirm, rickety, sapless, weak.

weakly (adjective)	decrepit (adjective)
lacking bodily or muscular strength or vitality	lacking bodily or muscular strength or vitality
	worn and broken down by hard use

weakly (adverb)	decrepit (adverb)
in a weak or feeble manner or to a minor degree