Treacherously

And I said, My leanness, my leanness, woe unto me! The treacherous have dealt treacherously; yea, the treacherous have dealt very treacherously.

The door creaked treacherously.

The soap slipped treacherously out of my hands.

Nostalgia treacherously assailed me.

She says trucks are unable to traverse the treacherously narrow roads.

Jugurtha was treacherously captured.

The old man sat behind a fortress of magazines and books, treacherously reading the funnies in a newspaper.

The former spy behaved treacherously.