Definition of watchful adjective from the Oxford Advanced American Dictionary

 

watchful

 adjective
adjective
NAmE//ˈwɑtʃfl//
 
 
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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.
NAmE//ˈwɑtʃfəli//
 
adverb
watchfulness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: watchful