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Not too bright and certainly not sharp!
Usefully juxtaposed to something really sharp.
The opposite of "sharp as a razor" - clearcut and incisive.
That guy is as sharp as a beach ball - he didn't even realise the girls were teasing him when they fell on the floor laughing! He was well taken in!
by Brian Butterly February 09, 2007

Words related to Sharp as a Beach Ball

beachball clueless naive slow thick