unhearing vs stone-deaf

unhearing and stone-deaf both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unhearing	No	Yes	No	No
stone-deaf	No	Yes	No	No

As adjectives, unhearing and stone-deaf are synonyms defined as:

Other synonyms of unhearing include deaf as a post, profoundly deaf.

unhearing (adjective)	stone-deaf (adjective)
totally deaf; unable to hear anything	totally deaf; unable to hear anything