acuity — English Dictionary

Noun

1. Sharpness or acuteness, as of a needle, wit, etc.

2. The ability to think, see, or hear clearly.

   Usage

   • Figurative

   Examples

   The old woman with dementia lost her mental acuity.

   More examples (2)

   And yet [Ray] Dalio’s acuity prompts an awkward question: how much of Bridgewater’s success comes not from the way it is organized, or any notion of “radical transparency,” but from the boss’s raw investment abilities?

   Donald Trump’s frequently bizarre public appearances[…] have once again raised questions about his mental acuity, experts say. […] During his presidency, Joe Biden was subjected to intense speculation over his mental acuity – including from Trump.

Noun

1. sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)

   Synonyms

   visual acuitysharp-sightedness

   Broader terms

   sightvisionvisual sensevisual modality

2. a quick and penetrating intelligence

   Synonyms

   acutenesssharpnesskeenness

   Broader terms

   intelligence

   Examples

   he argued with great acuteness

   I admired the keenness of his mind