Crossword Genius

It can't easily be described in French (2,2,4,4)


I believe the answer is:

je ne sais quoi

(Other definitions for je ne sais quoi that I've seen before include "Quality or thing that's hard to describe" , "Quality that can't be easily described" , "Indefinable quality" , "Elusive but pleasing quality" , "Special unknown ingredient" .)

I've seen this clue in The Guardian.
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