IPA: //ˈdɛfɪst//
KK: /dɛfɪst/
The term used to describe someone who cannot hear at all, to the greatest extent possible.
She is the deafest person in her family, having lost her hearing completely at a young age.
Comparative: deafier
Superlative: deafest
The word 'deafest' is formed from 'deaf' (from Old English 'deaf', meaning unable to hear) and the superlative suffix '-est' (meaning most). Therefore, 'deafest' means the most unable to hear or the highest degree of deafness.
Think of 'deaf' as being unable to hear, and when you add '-est', it indicates the highest degree of that inability. So, 'deafest' means the most unable to hear.