Solution: Experience of feeling unfamiliar with something that's actually quite familiar to you - NYT Crossword

The “Experience of feeling unfamiliar with something that’s actually quite familiar to you” is the opposite of déjà vu, or “already seen”: JAMAIS VU, or “never seen.” This is a debut; both terms are borrowed from the French (and never to be returned). There’s another, related term that ought to resonate with weekend crossword solvers: Presque vu, or “almost seen,” is when you know you know something, but you just don’t know what it is (and you also just know that you will know it at 3 a.m., or when it’s too late for it to matter, whichever is more annoying).