| seeing(adjective, understanding, keen, sensible, certain) |
| sensitive to(expression, adjective, understanding, keen, sensible) |
| sentient(adjective, understanding, keen, sensible, certain) |
| streetwise |
| supraliminal(adjective, understanding, keen, sensible, certain) |
| sure(adjective, understanding, keen, sensible, certain) |
| switched on(expression, adjective, cool, familiar, groovy) |
| tuned in(expression, adjective, understanding, cool, sensible) |
| turned on(expression, adjective, cool, familiar, groovy) |
| undeceived |
| understanding(adjective, keen, sensible, certain, alert) |
| up on(expression, adjective, cool, sensible, familiar) |
| versed(adjective, cool, sensible, familiar, knowledgeable) |
| vigilant(adjective, understanding, keen, sensible, certain) |
| watchful(adjective, understanding, keen, sensible, certain) |
| with it(expression, adjective, understanding, cool, keen) |
| witting(adjective, understanding, keen, sensible, certain) |
| acute(perceptive, observant, insightful) |
| aground(witting, versant, pansophic) |
| all wound up(expression, adjective, idiom, desirous, exultant) |