Having nice or quick sensibility; susceptible to slight impressions; acting keenly on the senses; sharp; keen; intense; as, a man of acute eyesight, hearing, or feeling; acute pain or pleasure
{s} grave, serious, severe; keen, sharp, sensitive; penetrating, shrewd; less than 90 degrees (Geometry); pointed
An acute accent is a symbol that is placed over vowels in some languages in order to indicate how that vowel is pronounced or over one letter in a word to indicate where it is stressed. You refer to a letter with this accent as, for example, e acute. For example, there is an acute accent over the letter `e' in the French word `café'
having or experiencing a rapid onset and short but severe course; "acute appendicitis"; "the acute phase of the illness"; "acute patients"
of critical importance and consequence; "an acute (or critical) lack of research funds"
Having nice discernment; perceiving or using minute distinctions; penetrating; clever; shrewd; opposed to dull or stupid; as, an acute observer; acute remarks, or reasoning
Of an abnormal condition of recent or sudden onset, in contrast to delayed onset; this sense does not imply severity (unlike the common usage)
having or experiencing a rapid onset and short but severe course; "acute appendicitis"; "the acute phase of the illness"; "acute patients" of critical importance and consequence; "an acute (or critical) lack of research funds" extremely sharp or intense; "acute pain"; "felt acute annoyance"; "intense itching and burning" having or demonstrating ability to recognize or draw fine 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" of an angle; less than 90 degrees
Sharp at the end; ending in a sharp point; pointed; opposed to blunt or obtuse; as, an acute angle; an acute leaf