aliencord
noun
It’s the palpable sorrow that fills your chest when the person you used to know becomes unrecognizable, forgetting the fond memories and the traits that defined your bond, leaving you with a hollow feeling as strangers staring into familiar eyes that have lost their warmth.
From Latin 'alienus' (strange, foreign) and Middle English 'corde' (heart), depicting the foreign heartache upon seeing someone unchanged yet different. Pronounced "AY-lee-en-kord"