watchful
/ˈwɔt͡ʃ.fəl/ adjective B2- Fully observant, vigilant, or aware. · The teacher kept a watchful eye on her pupils during the school trip.
From the library
Trying doors as he went, twirling his club with many intricate and artful movements, turning now and then to cast his watchful eye adown the pacific thoroughfare, the officer, with his stalwart form and slight swagger, made a fine picture of a guardian of the peace.
Elizabeth was watchful enough to see it all, but she could see it and write of it without material pain.
This sudden kindness at your hands will only make me more watchful, lest under these unexpected favours to myself, you have some private ends to accomplish for your own benefit, and for my master’s injury.”
Day and night the nurse covered the child, and day and night the silent, watchful mother seemed to be lying in wait as a wolf waits for a lamb.
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