| sagacious(adjective, understanding, keen, sensitive, perceptive) |
| sage(adjective, understanding, keen, sensitive, perceptive) |
| seeing(perceptive, observant, insightful) |
| sensible(perceptive, observant, insightful) |
| sensitive to(expression, perceptive, observant, insightful) |
| sentient(perceptive, observant, insightful) |
| sharp(adjective, understanding, keen, smart, sensitive) |
| shrewd(adjective, understanding, sharp, smart, perceptive) |
| smart(adjective, understanding, sharp, shrewd, perceptive) |
| supraliminal(perceptive, observant, insightful) |
| sure(perceptive, observant, insightful) |
| understanding(adjective, sharp, smart, sensitive, shrewd) |
| vigilant(perceptive, observant, insightful) |
| watchful(perceptive, observant, insightful) |
| with it(expression, perceptive, observant, insightful) |
| witting(perceptive, observant, insightful) |