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The state of being perspicacious; acuteness of sight or of intelligence; acute discernment. Sir T. Browne.

The relative acuteness or gravity of a tone, determined by the number of vibrations which produce it; the place of any tone upon a scale of high and low.

Acuteness of perception; keen sensibility. Would not quickness of sensation be an inconvenience to an animal that must lie still Locke

The quality of being sagacious; quickness or acuteness of sense perceptions; keenness of discernment or penetration with soundness of judgment; shrewdness. Some [brutes] show that nice sagacity of smell. Cowper. Natural sagacity improved by generous education. V. Knox.

phasized: "Native practical intelligence, natural prudence, mother wit, tact in behavior, acuteness in the observation of character, in contrast to habits of acquired learning or of speculation." -- Moral sense. See under Moral, (a). -- The inner, or internal, sense, capacity of the mind to be aware of its own states;…

The quality or condition of being sharp; keenness; acuteness.

Artlessness of mind; freedom from cunning or duplicity; lack of acuteness and sagacity. Marquis Dorset, a man, for his harmless simplicity neither misliked nor much regarded. Hayward. In wit a man; simplicity a child. Pope.

of the voluntary and rational soul; that state of the animal in which there is a lessened acuteness of sensory perception, a confusion of ideas, and a loss of mental control, followed by a more or less unconscious state. "A man that waketh of his sleep." Chaucer. O sleep, thou ape of death. Shak.

Marked by acuteness or shrewdness; quick in suggestion or reply; vivacious; witty; as, a smart reply; a smart saying. Who, for the poor renown of being smart Would leave a sting within a brother's heart Young. A sentence or two, . . . which I thought very smart. Addison.

Refinement; extreme acuteness; subtlety. Intelligible discourses are spoiled by too much subtility in nice divisions. Locke.

Being in unison; having the same degree of gravity or acuteness; sounded alike in pitch.