What does "watchfulness" mean?

The state or quality of being watchful; alertness, vigilance or wakefulness.

Watchfulness

Common synonyms include: alertness, vigilance, attentiveness, being careful, care, careful attention.

noun

noun ·Uncommon ·Advanced level

Noun

1
The state or quality of being watchful; alertness, vigilance or wakefulness. countable, uncountable
"Continuous watchfulness is maintained around the clock."
2
vigilant attentiveness wordnet
3
the process of paying close and continuous attention wordnet

"Continuous watchfulness is maintained around the clock."

From watchful + -ness.