WordWeb Online

1. In an acute manner
   "she pitied her sister acutely"; "acutely aware"
    
2. Having a rapid onset
   "an acutely debilitating virus"
    
3. Changing suddenly in direction and degree
   "the visor was acutely peaked"; "her shoes had acutely pointed toes"
   - sharply, sharp
    
4. In a shrewd manner
   "he was acutely insightful"
   - astutely, shrewdly, sagaciously, sapiently, advisably, perspicaciously

See also: acute, sharp

Antonym: chronically