Simple past tense and past participle of deafen.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "deafened" in a sentence
"Even to conversation and acted plays, he gave an inattentive ear, instincts incapable of clear expression deafened him and blinded him; he was Milton’s lion35 rising up, pawing out of the earth, but unlike that lion, stuck half-way."
"It was illness that blinded and deafened Helen Keller."
"ETA: Via Neil Gaiman, here's a better photo of me (and him and Frank Wu, who nearly deafened me with his whoops of delight)."