Phenomenon of experiencing something as strangely new even though one has experienced it before

JAMAISVU

["This French term describes the opposite of déjà vu, where the familiar feels unfamiliar."]

The clue describes the opposite of déjà vu, where something familiar feels strangely unfamiliar. "Jamais vu" is a French term meaning "never seen," fitting the definition perfectly. The answer is written as one word without a space, following common crossword conventions for foreign phrases.