What does acute mean?
Acute is an adjective describing something sharp, intense, or extreme in degree. It most often characterizes feelings, needs, or problems that are severe and pressing — acute pain, acute anxiety, an acute shortage — and it also describes a mind or perception that is remarkably keen and penetrating. In medicine, acute has a precise technical meaning: an illness or condition that comes on suddenly and runs a short course, in contrast to a chronic one that persists over a long period. In geometry, an acute angle is one measuring less than ninety degrees. The word derives from Latin acutus, meaning 'sharpened' or 'pointed', from the verb acuere, 'to sharpen', which also yields related words such as acumen and acuity. Because it conveys both intensity and precision, acute is a versatile and widely used word across medical, intellectual, and everyday contexts.
adjective(Of a quality or feeling) intense and sharp; keenly perceptive or penetrating. (Of an illness or problem) severe and of sudden onset, as opposed to chronic.
- Intense, sharp, or extreme in degree (e.g. acute pain, acute embarrassment).
- Having or showing keen perception or intelligence (e.g. an acute mind).
- Medicine: (of an illness or symptom) severe and of rapid onset, not chronic.
- Geometry: (of an angle) less than 90 degrees.
"She felt an acute pang of guilt as she read the letter."
"The region faced an acute shortage of clean drinking water after the flood."
"His acute observation of human behaviour made his novels feel uncannily true to life."
Doctors borrowed 'acute' straight from Latin for a reason: it literally means 'sharpened to a point' — the same root that gives us a needle's acuity.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of acute
Acute comes from Latin acutus, the past participle of acuere, meaning 'to sharpen', ultimately connected to acus, 'needle'. It entered English via Old French in the late Middle Ages, initially carrying senses of sharpness both literal and figurative. Its cognates include acumen, acuity, and acupuncture, all built on the same Latin root. The medical sense contrasting with 'chronic' became established as clinical terminology developed from ancient Greek medicine.
Related word forms
How acute is actually used
Formal to neutral register; common in medical, scientific, and journalistic writing. In medicine, 'acute' is defined strictly by onset and duration rather than severity alone, though everyday use often conflates the two.
Easily confused with acute
'Acute' describes conditions that are severe and sudden in onset, while 'chronic' describes conditions that are long-lasting and persistent.