| Word | Definitions | Synonyms |
|---|---|---|
| watchful | (adjective) engaged in or accustomed to close observation | Synonyms: alert |
| (adjective) experiencing or accompanied by sleeplessness | Synonyms: insomniac, sleepless | |
| (adjective) carefully observant or attentive; on the lookout for possible danger | Synonyms: argus-eyed, open-eyed, vigilant, wakeful |