unfit vs unsound

unfit and unsound both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unfit	No	Yes	Yes	No
unsound	No	Yes	No	No

As adjectives, unfit and unsound are synonyms defined as:

Other synonyms of unfit include bad.

unfit (adjective)	unsound (adjective)
not in good physical or mental condition; out of condition	not sound financially
below the required standards for a purpose	not in good condition; damaged or decayed
physically unsound or diseased	suffering from severe mental illness
	containing or based on a fallacy
	physically unsound or diseased
	of e.g. advice

unfit (verb)	unsound (verb)
make unfit or unsuitable