| observant(adjective, understanding, keen, alert, sensitive) |
| observing(perceptive, observant, insightful) |
| on to(expression, perceptive, observant, insightful) |
| perceiving(perceptive, observant, insightful) |
| piercing(adjective, sharp, sensitive, astute, discriminating) |
| quick(adjective, understanding, keen, alert, sensitive) |
| recognizing(perceptive, observant, insightful) |
| remarking(perceptive, observant, insightful) |
| responsive(adjective, understanding, keen, alert, sensitive) |
| savvy(adjective, understanding, keen, alert, sensitive) |
| seeing(perceptive, observant, insightful) |
| selective(sharp, sensitive, discriminating) |
| sensible(perceptive, observant, insightful) |
| sensitive to(expression, perceptive, observant, insightful) |
| sentient(perceptive, observant, insightful) |
| shrewd(adjective, sharp, sensitive, piercing, astute) |
| subtle(adjective, sharp, sensitive, piercing, astute) |
| supraliminal(perceptive, observant, insightful) |
| sure(perceptive, observant, insightful) |
| understanding(sensitive, perceptive, observant, insightful) |