watchful

With no guides but the stars by night and the blue edge of the land by day, there was need for keen eyesight and watchfulness.

There was no real danger she could think of, but her instinct warned her to watchfulness, to be prepared for anything.

We may no doubt sin through the passions, and therefore we need a minimum of watchfulness to meet temptations which come our way.

Sleep not, then; but, at the turn of the night, be all vigilance and watchfulness.