Aphantalgia (noun):

A sentiment often triggered upon encountering a subject or skill that one was once proficient in, but has not engaged with for an extended period, leading to its disappearance from one's cognitive grasp.
Upon stumbling upon his old guitar gathering dust in the attic, John was overcome with a wave of aphantalgia, a poignant longing for the musical skills that had faded away due to years of neglect.
by Kewk July 3, 2023
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