Crossword Genius

Not 100% solid (4)

Ross

I believe the answer is:

iffy

(Other definitions for iffy that I've seen before include "Chancy, suspect" , "Informally dubious, not definite" , "Dubious, risky (inf.)" , "Uncertain (colloq.)" , "Not certain, doubtful" .)

I've seen this clue in the LA Times.
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