acute

adjective

• 1(of a bad, difficult, or unwelcome situation or phenomenon) present or experienced to a severe or intense degree:an acute housing shortage the problem is acute and getting worse
• (of a disease or its symptoms) of short duration but typically severe:acute appendicitisOften contrasted with chronic.
• denoting or designed for patients with acute conditions:acute hospital services acute patients

• 2having or showing a perceptive understanding or insight: shrewd:an acute awareness of changing fashions
• (of a physical sense or faculty) highly developed; keen:an acute sense of smell

• 3(of an angle) less than 90°.
• having a sharp end; pointed.
• (of a sound) high; shrill.

noun

• short for acute accent.