IPA: /ˈdɛfər/
KK: /ˈdɛfər/
Having a greater inability to hear compared to someone or something else.
After the loud concert, I felt even deafer than before.
Deafer is formed from "deaf" (from Old English "deaf", meaning unable to hear) and the comparative suffix "-er" (meaning more). The word "deafer" means more unable to hear or having a greater degree of deafness than something or someone else.
Think of someone who is 'more unable to hear' — 'deaf' describes the inability to hear, and '-er' indicates a comparison.