2. (adj)acute having or experiencing a rapidonset and short but severe course "acute appendicitis"; "the acute phase of the illness"; "acute patients"
3. (adj)acute, intense extremely sharp or intense
"acute pain"; "felt acute annoyance"; "intense itching and burning"
4. (adj)acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp having or demonstrating ability to recognize or drawfine distinctions
"an acute observer of politics and politicians"; "incisive comments"; "icy knifelike reasoning"; "as sharp and incisive as the stroke of a fang"; "penetrating insight"; "frequent penetrative observations"