acuity

noun

Etymology: From Middle English acuite, acuyte, from Middle French acuité, from Medieval Latin acuitas, irreg., from Latin acuō (“sharpen”).

1. Sharpness or acuteness, as of a needle, wit, etc.
2. The ability to think, see, or hear clearly.

   “The old woman with dementia lost her mental acuity.”

   “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?”