Watchful
/wˈɑtʃfəl/
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Definition
(adj) Fully observant, vigilant, or aware.
Sentence Examples
He was watchful for any sign of diabetes.
Do not try to run away, please, because the eyes of your enemies are watchful.
CEFR Practice Quiz
The mother kept a ____ eye on her children as they played near the edge of the deep swimming pool today.