'Deadly' in the Bible

They shall take up venomous snakes, and if they drink any deadly poison it shall do them no harm whatever. They shall lay their hands on the sick, and the sick shall recover."

During the passage He fell asleep, and there came down a squall of wind on the Lake, so that the boat began to fill and they were in deadly peril.

But the tongue no man or woman is able to tame. It is an ever-busy mischief, and is full of deadly poison.