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English definition of “watchful”

watchful

adjective     /ˈwɒtʃ.fəl/ US  /ˈwɑːtʃ-/
paying careful attention and ready to deal with problems : Under the watchful eye of their mother , the two boys played on the shore . She keeps a watchful eye on her husband to see that he behaves himself.Cautious and vigilantPaying attention and being careful watchfully     /-i/ adverb Slowly and watchfully they walked around the perimeter of the clearing .Cautious and vigilantPaying attention and being careful watchfulness     /-nəs/ noun [U] Cautious and vigilantPaying attention and being careful
(Definition of watchful adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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