1) Apprehensive 2) Astute 3) Attractive 4) Cleareyed 5) Discriminating 6) Knowledgeable 7) Perceptive 8) Percipient 9) Prescient 10) Prophetic 11) Sapient 12) Tactful 13) Wise 1) Astute 2) Aware 3) Clear 4) Clear-eyed 5) Clear-sighted 6) Critical 7) Cultivated 8) Discriminating 9) Insightful 10) Judicious 11) Keen 12) Observant 13) Perceptive 14) Percipient 15) Perspicacious 16) Prescient 17) Quick to understand 18) Refined 19) Selective 20) Sensitive 21) Sharp 22) Tasteful 
• (p. pr. & vb. n.) of Discern • (a.) Acute; shrewd; sagacious; sharp-sighted.
Dis·cern'ing adjective Acute; shrewd; sagacious; sharp-sighted. Macaulay. 
[adj] - unobtrusively perceptive and sympathetic 2. [adj] - able to make or detect effects of great subtlety 3. [adj] - having or revealing keen insight and good judgment
discerning Showing good judgment and good taste.
discreet adjective unobtrusively perceptive and sympathetic; `a discerning editor`; `a discreet silence`
showing good or outstanding judgment and understanding: a discerning critic of French poetry.
having or revealing keen insight and good judgment having or revealing keen insight and good judgment having or revealing keen insight and good judgment