| judicious(adjective, smooth, reasonable, keen, sharp) |
| keen(adjective, smooth, sharp, smart, bright) |
| loath(adjective, cautious, suspicious, wary) |
| mindful(adjective, cautious, aware, attentive, suspicious) |
| on the ball(expression, adjective, idiom, smooth, keen) |
| on the job(expression, idiom, sharp, bright, lively) |
| on the lookout(expression, idiom, sharp, lively, careful) |
| overcautious(restrained, hesitant, reserved, cautious, suspicious) |
| pawky |
| perceptive(adjective, smooth, keen, sharp, smart) |
| plotting(adjective, mean, smooth, smart, cunning) |
| ready(sharp, bright, lively, active, alert) |
| reluctant(adjective, cautious, suspicious, wary) |
| restrained(adjective, quiet, careful, hesitant, reserved) |
| sapient(adjective, smooth, smart, intelligent, wise) |
| sensible(adjective, smooth, reasonable, keen, sharp) |
| serpentine(adjective, sly, winding) |
| sneaky(mean, smooth, cunning, dubious, untrustworthy) |
| sophistical |
| stealthy(mean, smooth, cunning, knowing, sly) |