vigilant

Synonyms

alert, Argus-eyed, attentive, awake, observant, open-eyed, watchful, wide-awake;

Antonyms

asleep;

Near Antonyms

absent, absentminded, absorbed, abstracted, daydreaming, dazed, distracted, dreaming, dreamy, engrossed, faraway, insensible, oblivious, preoccupied;

sleeping, unaware, unconscious, unknowing, unwitting;

careless, heedless, inattentive, unheeding, unmindful, unthinking, unwary;

unprepared, unready;

Related Words

alive, aware, conscious, sensitive;

cognizant, heedful, keen, mindful, observing, regardful, sharp, sharp-eyed;

hyperalert, hypervigilant, sleepless, wakeful;

careful, cautious, chary, wary;

prepared, ready;

Phrases

on guard, on one's toes, on the alert, on the ball, on tiptoe;