'Foul' in the Bible

And the fish that are in the river shall die, and the river shall become foul; and the Egyptians shall loathe to drink water from the river.

And the fish that were in the river died; and the river became foul, and the Egyptians could not drink water from the river; and the blood was throughout all the land of Egypt.

Notwithstanding they hearkened not unto Moses; but some of them left of it until the morning, and it bred worms, and became foul: and Moses was wroth with them.

And they laid it up till the morning, as Moses bade: and it did not become foul, neither was there any worm therein.