IPA: /æmˈniːziæk/
KK: /æmˈniːziæk/
A person who has lost their memory or has difficulty remembering things due to a condition called amnesia.
The amnesiac struggled to remember his own name after the accident.
Amnesiac → It is formed from "amnesia" (from Greek "amnesia", meaning forgetfulness) and the suffix "-ac" (meaning pertaining to). The word "amnesiac" refers to someone who is pertaining to or suffering from forgetfulness.
Think of 'amnesia' which means forgetfulness, and remember that an 'amnesiac' is someone who is related to or affected by forgetfulness.