| slick(adjective, cool, smart, significant, intelligent) |
| slippery(smart, shrewd, clever, subtle, artful) |
| sly(smart, shrewd, clever, subtle, artful) |
| smart(adjective, cool, significant, intelligent, brilliant) |
| smooth(smart, shrewd, clever, subtle, artful) |
| sophic(adjective, cool, significant, intelligent, brilliant) |
| sport(familiar, sophisticated, knowledgeable, skilled, competent) |
| strategic(cautious, tactful, circumspect) |
| street smart(expression, smart, shrewd, clever, subtle) |
| suave |
| tactful(cautious, circumspect) |
| temperate(cautious, tactful, circumspect) |
| tested(familiar, sophisticated, knowledgeable, skilled, competent) |
| thoughtful(sensible, wise, cautious, shrewd, tactful) |
| trained(familiar, sophisticated, knowledgeable, skilled, competent) |
| tried and true(expression, idiom) |
| tuned-in(adjective, cool, smart, significant, intelligent) |
| undeceived(adjective, dissatisfied, disappointed, disheartened, embittered) |
| versed(familiar, knowledgeable, skilled, qualified, informed) |
| vet(familiar, sophisticated, knowledgeable, skilled, competent) |