deadly vs baneful

deadly and baneful both are adjectives.

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

As adjectives, deadly and baneful are synonyms defined as:

Other synonyms of deadly include pernicious, pestilent.

deadly (adjective)	baneful (adjective)
exceedingly harmful	deadly or sinister
extremely poisonous or injurious; producing venom	exceedingly harmful
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

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