← BackshareGuessacuity/əˈkjuː.ə.ti/nounSharpness or keenness of thought, vision, or hearing.The musician's auditory acuity allowed her to hear the slightest off-key note.His mental acuity remained strong even in old age.The eye doctor tested her visual acuity with a chart of letters.SynonymssharpnesskeennessAntonymsdullness