watchful

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

1. engaged in or accustomed to close observation
- caught by a couple of alert cops
- alert enough to spot the opportunity when it came
- constantly alert and vigilant, like a sentinel on duty
• Syn:
alert
• Ant:
unalert (for: alert)
• Similar to:
argus-eyed, open-eyed, vigilant, wakeful, fly,
heads-up, wide-awake, lidless, sleepless
• See Also:
awake, lively, wary
• Derivationally related forms:
watchfulness, alert (for: alert), alertness (for: alert)
2. experiencing or accompanied by sleeplessness
- insomniac old people
- insomniac nights
- lay sleepless all night
- "twenty watchful, weary, tedious nights"- Shakespeare
• Syn:
insomniac, sleepless
• Similar to:
awake
• Derivationally related forms:
sleeplessness (for: sleepless)

• Từ đồng nghĩa / Synonyms:
  insomniac, sleepless, alert
• Từ trái nghĩa / Antonyms:
  unalert, unwatchful, unvigilant