IPA: /fərˈɡɛtfəl.nəs/
KK: /fərˈɡɛtfəl.nəs/
The state of not being able to remember things or the tendency to forget.
Her forgetfulness often leads her to misplace her keys.
Forgetfulness → It is formed from "forget" (from Old English *forgietan*, meaning to lose the memory of) and "-ness" (meaning the state or quality of). The word "forgetfulness" refers to the state of being unable to remember or losing memory.
Think of the state of 'losing memory' ('forget') and how that relates to the quality of being unable to remember, which is what 'forgetfulness' means.