watchful

[woch-fuhl]
adjective
1.
vigilant or alert; closely observant: The sentry remained watchful throughout the night.
2.
Archaic. wakeful.

Origin:
1540–50; watch + -ful

watchfully, adverb
watchfulness, noun
self-watchfulness, noun
unwatchful, adjective
unwatchfully, adverb
unwatchfulness, noun


1. attentive, heedful, careful, circumspect, cautious, wary. See alert.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
watchful (ˈwɒtʃfʊl)
 
adj
1.  vigilant or alert
2.  archaic not sleeping
 
'watchfully
 
adv
 
'watchfulness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The three sports that have been under their watchful eye since the report's
  inception continue to post higher marks every year.
Others climbed on top of city vehicles, though they were quickly chased off by
  watchful police.
She accepted the fact that she might have a serious illness brewing, but
  watchful waiting was the only treatment option.
At the same time, nature has ways of surprising us, and it pays to be watchful.
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