Come, if you have done it in an unguarded moment there is no help for it!
Clearetus the captain learnt of this place, that it was but a little one and unguarded.
She knew music too, and in an unguarded moment Peter admitted that he had studied.
Yet here in the turret, unguarded by insulation, I could say nothing.
In other words, he bided his time, and when he did strike, ...