'Unclean' in the Bible

Then I saw three unclean spirits that looked like frogs coming out of the mouth of the dragon, out of the mouth of the beast, and out of the mouth of the false prophet.

Now the woman was dressed in purple and scarlet clothing, and adorned with gold, precious stones, and pearls. She held in her hand a golden cup filled with detestable things and unclean things from her sexual immorality.

He shouted with a powerful voice: "Fallen, fallen, is Babylon the great! She has become a lair for demons, a haunt for every unclean spirit, a haunt for every unclean bird, a haunt for every unclean and detested beast.

but nothing ritually unclean will ever enter into it, nor anyone who does what is detestable or practices falsehood, but only those whose names are written in the Lamb's book of life.