Meaning of “acute” - Learner’s Dictionary

acute

adjective uk us /əˈkjuːt/
EXTREME

An acute problem or negative feeling is extreme:

There's an acute shortage of medical staff.
acute pain
acute anxiety
ANGLE

An acute angle is less than 90 degrees.

QUICK TO NOTICE

quick to notice or understand things:

an acute mind
Dogs rely on their acute sense of smell.

(Definition of “acute” from the Cambridge Learner’s Dictionary © Cambridge University Press)