unpardonable vs deadly

unpardonable and deadly both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unpardonable	No	Yes	No	No
deadly	No	Yes	No	Yes

unpardonable (adjective)	deadly (adjective)
not admitting of pardon	exceedingly harmful
	extremely poisonous or injurious; producing venom
	involving loss of divine grace or spiritual death
	(of a disease) having a rapid course and violent effect
	causing or capable of causing death
	of an instrument of certain death

unpardonable (adverb)	deadly (adverb)
	(used as intensives) excessively
	as if dead