Definition of watchful adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈwɒtʃfl//
; NAmE NAmE//ˈwɑːtʃfl//
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paying attention to what is happening in case of danger, accidents, etc. Her expression was watchful and alert. His mother kept a watchful eye on him. The children played under the watchful eye of their teacher. She seemed watchful and slightly worried.
See the Oxford Advanced American Dictionary entry: watchful