Crossword Genius

Highly debatable (4)

Ross

I believe the answer is:

iffy

(Other definitions for iffy that I've seen before include "Uncertain (colloq.)" , "Sixth (RU) Nation" , "Dubious (colloq.)" , "Informally dubious, not definite" , "Informally dubious or uncertain" .)

I've seen this clue in The New York Times.
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