| subtle(sharp, sensitive, deep, thoughtful, shrewd) |
| 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-read |
| 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) |
| skillful(adjective, cool, delicate, significant, sensitive) |
| able to recognize(expression, idiom, perceptive, observant) |
| abreast(familiar, informed, well-informed) |
| abstruse(deep, thoughtful, reflective) |
| accurate(sharp, smart, critical, meaningful, astute) |
| acerbic(critical, meaningful, incisive) |
| acid(critical, meaningful, incisive) |
| acquainted(familiar, perceptive, informed, observant, well-informed) |
| acroamatic(deep, thoughtful, reflective) |
| adroit(keen, smart, sensitive, shrewd, perceptive) |