'Unclean Spirit' in the Bible

And I saw out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet, three unclean spirits, as frogs;

And he cried with a strong voice, saying, Great Babylon has fallen, has fallen, and has become the habitation of demons, and a hold of every unclean spirit, and a hold of every unclean and hated bird;