adjective, un·clean·er, un·clean·est.
- not clean; dirty.
- morally impure; evil; vile: unclean thoughts.
- Chiefly Biblical. having a physical or moral blemish so as to make impure according to the laws, especially the dietary or ceremonial laws: an unclean animal; unclean persons.
- lacking moral, spiritual, ritual, or physical cleanliness
adj.Old English unclæne, “morally impure, defiled, unfit for food,” from un- (1) “not” + clean (adj.). Literal sense of “dirty” is recorded from mid-13c.