razor-sharp

1. Literally, very sharp, like a razor. Stand back, that tool is razor-sharp! Please be careful cutting those vegetables with such a razor-sharp knife.

2. Particularly clear, perceptive, and/or intelligent. Victoria may seem quiet, but she always has these razor-sharp insights on the texts we're reading. The think tank is known for razor-sharp analysis of world affairs. A lot of people are funny, but she has razor-sharp wit.

See also:

cut (someone or something) to (someone or something)
cut to
razor
(as) sharp as a razor
sharp as a razor
tack
sharp
sharp as a tack
(as) sharp as a tack
the sharp end

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