discerning in WordNet English dictionary

1. quick to understand
   "a kind and apprehensive friend"- Nathaniel Hawthorne
   apprehensive  discerning 
   
2. having or revealing keen insight and good judgment
   "a discerning critic"; "a discerning reader"
   discerning 
   
3. able to make or detect effects of great subtlety; sensitive
   "discerning taste"; "a discerning eye for color"
   discerning 
   
4. unobtrusively perceptive and sympathetic
   "a discerning editor"; "a discreet silence"
   discerning  discreet