deathly vs fatal

deathly and fatal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
deathly	No	Yes	No	Yes
fatal	No	Yes	No	No

deathly (adjective)	fatal (adjective)
having the physical appearance of death	bringing death
causing or capable of causing death	having momentous consequences; of decisive importance
	controlled or decreed by fate; predetermined
	(of events) having extremely unfortunate or dire consequences; bringing ruin

deathly (adverb)	fatal (adverb)
to a degree resembling death
to an extreme degree