adjective

watchful

watchful, vigilant, observant

A watchful guard stood at the gate.

A watchful guard stood at the gate.

She kept a watchful eye on the children.

She kept a watchful eye on the children.

watchful ((of sth./sb.)) paying careful attention to (sth./sb.) He is always watchful of danger.

Synonyms: vigilant, alert, observant; Antonyms: inattentive, careless

From 'watch' (to observe) and the suffix '-ful' (full of). Literally 'full of watching'.

Imagine an owl, known for its 'watchful' eyes, carefully observing everything around it.

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