adjective, un·clean·er, un·clean·est.

  1. not clean; dirty.
  2. morally impure; evil; vile: unclean thoughts.
  3. 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.


  1. 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.

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