1 Sharp at the end; ending in a sharp point; pointed; — opposed to blunt or obtuse; as, an acute angle; an acute leaf.
2 Having nice discernment; perceiving or using minute distinctions; penetrating; clever; shrewd; — opposed to Ant: dull or Ant: stupid; as, an acute observer; acute remarks, or reasoning.
3 Having nice or quick sensibility; susceptible to slight impressions; acting keenly on the senses; sharp; keen; intense; as, a man of acute eyesight, hearing, or feeling; acute pain or pleasure.
4 High, or shrill, in respect to some other sound; — opposed to grave or low; as, an acute tone or accent.
Attended with symptoms of some degree of severity, and coming speedily to a crisis; — opposed to chronic; as, an acute disease. Acute angle (Geom.), an angle less than a right angle.
To give an acute sound to; as, he acutes his rising inflection too much. [R.] Walker.