* The detective watched the suspect's every move watchfully, waiting for any sign of a lie.
* The mother watched her child play in the park watchfully, ready to intervene if needed.
* The hikers moved through the dense forest watchfully, aware of the potential dangers lurking in the shadows.
* The soldiers stood guard watchfully, prepared to defend their position against any attack.
* The old dog watched the children playing in the yard watchfully, protecting them with his loyal heart.
"Watchfully" implies a sense of alertness, vigilance, and potential for danger or need for caution.