Crossword Genius

Less than right (5)

Ross

I believe the answer is:

acute

'less than right' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for acute that I've seen before include "Shrewd; serious" , "Critical: shrewd" , "Critical, serious" , "quick on the uptake" , "Extremely sharp or intense" .)

I've seen this clue in The Wall Street Journal and The New York Times.
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