When a teenager tells their parents they will clean up their room, and when called on not doing it they claim to not remember having said such a thing, it is an example of amnesia.
An example of amnesia is when a person is in a car accident where they injured their head, and when they wake up at the hospital they can’t remember who they are or anything about their life.
Origin of amnesia
From American Heritage Dictionary of the English Language, 5th Edition
- From modified Latin amnesia, from Ancient Greek ἀμνησία (amnēsia, “forgetfulness”).