broken-backed vs unfit

broken-backed and unfit both are adjectives.

Word	Noun	Adjective	Verb	Adverb
broken-backed	No	Yes	No	No
unfit	No	Yes	Yes	No

broken-backed (adjective)	unfit (adjective)
(of a ship) so weakened as to sag at each end	not in good physical or mental condition; out of condition
having the spine damaged	below the required standards for a purpose
(of a horse) having bones of the back united by a bony growth	physically unsound or diseased

broken-backed (verb)	unfit (verb)
	make unfit or unsuitable