Synonyms:
- advertent,
- agile,
- agog,
- alert,
- alive,
- all ears,
- all eyes,
- assiduous,
- attentive,
- awake,
- aware,
- bright,
- careful,
- clear-sighted,
- clear-witted,
- clearheaded,
- concentrated,
- conscious,
- diligent,
- earnest,
- finical,
- finicking,
- finicky,
- heedful,
- intense,
- intent,
- intentive,
- keen,
- meticulous,
- mindful,
- nice,
- niggling,
- nimble,
- observant,
- observing,
- on the,
- on the alert,
- on the job,
- open-eared,
- open-eyed,
- openmouthed,
- prompt,
- qui vive,
- quick,
- ready,
- regardful,
- sharp,
- sleepless,
- smart,
- unblinking,
- unnodding,
- unsleeping,
- unwinking,
- wakeful,
- watchful,
- wide-awake