Unclean spirit

This article deals with biblical and patristic terminology pertaining to the Greek pneuma akatharton and related phrases. See Pneuma for other uses of the word. For related beliefs and practices, see Demonic possession and Exorcism.

In English translations of the Bible, unclean spirit is a common rendering of Greek pneuma akatharton (πνεῦμα ἀκάθαρτον; plural pneumata akatharta (πνεύματα ἀκάθαρτα)), which in its single occurrence in the Septuagint translates Hebrew .