| narrow(adjective, close, mean, near, cheap) |
| noncommittal(restrained, hesitant, reserved, cautious, suspicious) |
| not missing a trick(expression, adjective, idiom, alert, careful) |
| not rash(expression, cautious, tactful, circumspect) |
| observative(adjective, careful, knowledgeable, cautious, aware) |
| observing(adjective, careful, knowledgeable, cautious, aware) |
| on lookout(expression, cautious, tactful, circumspect) |
| on the alert(expression, adjective, idiom, alert, attentive) |
| on the ball(expression, adjective, idiom, alert, careful) |
| on the job(expression, adjective, idiom, alert, careful) |
| on the lookout(expression, adjective, idiom, restrained, careful) |
| on the qui vive(expression, adjective, idiom, alert, careful) |
| on the rims(expression, idiom, mean, practical, prudent) |
| on the watch(expression, adjective, idiom, alert, careful) |
| on to(expression, careful, cautious, aware, attentive) |
| open-eyed(adjective, alert, careful, cautious, attentive) |
| opposed(adjective, wary, unenthusiastic, unwilling, disinclined) |
| penny-pinching(adjective, close, mean, spare, careful) |
| pennywise(adjective, close, mean, near, narrow) |
| petty(adjective, close, mean, near, narrow) |