jamais vu

n. (French) "never seen", internal sense of a person that familiar surroundings or that the familiar are unfamiliar in an odd manner, abnormal experience when a person feels that a routine or familiar happening has never taken place before

In psychology, the term jamais vu (from the French, meaning "never seen") is used to describe any familiar situation which is not recognized by the observer. Often described as the opposite of déjà vu, jamais vu involves a sense of eeriness and the observer's impression of seeing the situation for the first time, despite rationally knowing that he or she has been in the situation before.Jamais vu is more commonly explained as when a person momentarily doesn't recognize a word, person, or place that he/she already knows.
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Jamais vu French, never seen Psychiatry A group of paramnesias with complete absence of memory for events known to have been experienced by the Pt; [more]Jamais vu - Community and Resources

Noun
1. the experience of being unfamiliar with a person or situation that is actually very familiar; associated with certain types of epilepsy
(hypernym) confusion, mental confusion, confusedness, disarray

From the French, meaning "never seen". The illusion that the familiar does not seem familiar. The opposite of the feeling of "déjà vu."