| salty |
| savvy(smart, bright, intelligent, clever, sharp-witted) |
| sharp as a tack(expression, idiom, smart, bright, clever) |
| shrewd(smart, bright, intelligent, clever, subtle) |
| skillful(smart, bright, shrewd, clever, sharp-witted) |
| slippery(smart, shrewd, clever, subtle, artful) |
| sly(smart, shrewd, clever, subtle, artful) |
| smart as a whip(expression, idiom, smart, bright, active) |
| smooth(smart, shrewd, clever, subtle, artful) |
| sprightly |
| steel-trap |
| street smart(expression, smart, shrewd, clever, subtle) |
| streetwise(smart, shrewd, clever, subtle, artful) |
| talented |
| vigorous(bright, active, wise, sharp-witted, quick-thinking) |
| wary(smart, shrewd, clever, subtle, artful) |
| watchful(smart, shrewd, clever, subtle, artful) |
| whimsical |
| whiz(smart, bright, intelligent, clever, skillful) |
| wired(smart, bright, active, intelligent, wise) |