Longman Dictionary of Contemporary English homepage

watchful

 adjective
     
watch‧ful
1 very careful to notice what is happening, and to make sure that everything is all right:
The entrances are guarded by watchful security staff.
His eyes were watchful.
Keep a watchful eye on elderly residents.
2

under somebody's watchful eye

following someone's instructions or with someone's help:
Learn the basics under the watchful eye of a qualified instructor.
—watchfully adverb
—watchfulness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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