IPA: /ˈdɛfli/
KK: /dɛfli/
In a way that shows a lack of hearing or without the ability to hear.
She spoke deafly, unable to hear the responses from the audience.
Deafly → It is formed from "deaf" (from Old English "deaf", meaning unable to hear) and "-ly" (a suffix meaning in a manner of). The word "deafly" means in a manner that is unable to hear or without hearing.
Think of someone who is 'unable to hear' ('deaf') and how they might act 'in that manner' ('-ly'). This helps you remember that 'deafly' describes doing something in a way that is without hearing.