Meanings of stole unobserved in English

Julian's hand stole unobserved to hers, and told her, in its momentary pressure, to count on his brotherly sympathy and help.

A little before the appointed hour, she stole unobserved through the trees, opened the little gate, and found herself in the quiet, solitary lane.

He witnessed, from his hiding-place, the brief conference between myself and the policemen, and when they moved on, bearing the body, stole unobserved away.

So on the following evening towards nightfall, the conspirators stole unobserved into Pericone's house, which was entirely unguarded, and there hid themselves, as pre-arranged.