| receptive(bright, sharp-witted, quick-thinking) |
| responsive(adjective, understanding, kind, keen, sharp) |
| sane(adjective, hard, sound, reasonable, sensible) |
| sentient(adjective, understanding, cool, reasonable, significant) |
| serpentine(adjective, cunning) |
| snaky(adjective, cunning) |
| sneaky(adjective, mean, smooth, cunning, sly) |
| stealthy(mean, smooth, false, cunning, knowing) |
| strategic(cunning, subtle, tactful, suave) |
| streetwise(adjective, smooth, keen, sharp, smart) |
| underhanded |
| worldly(adjective, cool, smart, significant, intelligent) |
| adept(adjective, good, keen, sharp, smart) |
| apperceptive(perceptive, observant, insightful) |
| apprised(adjective, perceptive, aware, observant, insightful) |
| artificial |
| awake(adjective, understanding, cool, keen, sharp) |
| circumspect(adjective, kind, reasonable, friendly, smart) |
| clear-headed(adjective, intelligence wisdom) |
| comprehending(adjective, smart, bright, intelligent, brainy) |