Impossible to remove, wash away, or forget.
From Latin 'indelebilis' meaning 'not able to be removed', from 'in-' (not) and 'delere' (to wipe out, erase). It first described ink or marks that could not be erased.
An indelible memory is like permanent ink on your mind—no amount of scrubbing will fully erase it. The word often appears in emotional contexts because some experiences really do feel permanently written into us.
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