| sentient(adjective, understanding, cool, crack, significant) |
| sharp(adjective, understanding, cool, smooth, keen) |
| skillful(adjective, cool, significant, intelligent, brilliant) |
| slick(adjective, cool, significant, intelligent, brilliant) |
| smart(adjective, cool, smooth, sharp, sensible) |
| sophisticated(adjective, cool, significant, familiar, intelligent) |
| strong-minded |
| tuned-in(adjective, cool, smart, significant, familiar) |
| tuned in(expression, adjective, understanding, keen, sharp) |
| vigilant(adjective, understanding, cool, significant, intelligent) |
| watchful(adjective, understanding, cool, significant, intelligent) |
| well-informed(adjective, cool, sensible, significant, familiar) |
| wise to(expression, adjective, understanding, keen, sensitive) |
| with-it(adjective, cool, smart, significant, familiar) |
| witting(adjective, understanding, cool, crack, significant) |
| worldly(adjective, cool, significant, intelligent, brilliant) |
| worldly-wise(adjective, cool, significant, intelligent, brilliant) |
| crack(adjective, cool, significant, intelligent, brilliant) |
| able to recognize(expression, idiom, perceptive, witting, observant) |
| abreast(adjective, familiar, informed, learned, educated) |