Crossword Genius

Not obtuse (5)

Ross

I believe the answer is:

acute

'not obtuse' is the definition.
('acute' is the opposite to 'obtuse')

This is the entire clue.

(Other definitions for acute that I've seen before include "Excruciating" , "Sharp or crucial" , "quick on the uptake" , "Critical: shrewd" , "Very perceptive, having sharp mind" .)

I've seen this clue in the LA Times and the King Feature Syndicate.
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