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English definition of “acute”

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acute

adjective uk   /əˈkjuːt/ us  

acute adjective (EXTREME)

If a bad situation is acute, it causes severe problems or damage: She felt acute embarrassment/anxiety/concern at his behaviour. The problem of poverty is particularly acute in rural areas. An acute pain or illness is one that quickly becomes very severe: acute abdominal pains an acute attack of appendicitis

acute adjective (ACCURATE/CLEVER)

used to describe intelligence, senses, etc. that are very good, accurate, and able to notice very small differences: acute eyesight/hearing an acute sense of smell a woman of acute intelligence/judgment

acute adjective (ANGLE)

An acute angle is less than 90 degrees.
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acuteness
noun [U] uk   /-nəs/ us  

acute

noun [C] uk   ( also acute accent) us  
a sign that is written above a letter in some languages, showing you how to pronounce the letter: There's an acute accent on the e in "café".
(Definition of acute from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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