| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | on the lookout |
| Synonyms: | alert, all ears, attentive, careful, cautious, chary, circumspect, glued, guarded, heedful, hooked, keen, not missing a trick, observant, on guard, on one's toes, on the ball, on the job, on the qui vive, on the watch, open-eyed, prepared, ready, see after, see to, suspicious, unsleeping, vigilant, wakeful, wary, wide-awake, with eyes peeled |
| Antonyms: | inattentive, negligent |
| Main Entry: | on one's guard |
| Part of Speech: | adjective |
| Definition: | wary |
| Synonyms: | alert, careful, cautious, defensive, guarded, heedful, mindful, observant, on guard, on one's toes, on the lookout, on the watch, upon one's guard, vigilant, watchful |