noun, plural bes·ti·al·i·ties.

  1. brutish or beastly character or behavior; beastliness.
  2. indulgence in beastlike appetites, instincts, impulses, etc.
  3. an instance of bestial character or behavior.
  4. sexual relations between a person and an animal; sodomy.

noun plural -ties

  1. bestial behaviour, character, or action
  2. sexual activity between a person and an animal

late 14c., “the nature of beasts,” from bestial + -ity. Meaning “indulgence in beastly instincts” is from 1650s; sense of “sexual activity with a beast” is from 1611 (KJV).


  1. The quality or condition of being an animal or like an animal.
  2. Conduct or an action marked by depravity or brutality.
  3. Sexual relations between a human and an animal.
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