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Synonyms
lu·na·tic (lōṓnə-tĭk)

[Middle English lunatik, from Old French lunatique, from Latin lūnāticus, from lūna, moon.]

adjective 

  1. Suffering from lunacy; insane.
  2. Of or for the insane.
  3. Wildly or giddily foolish: a lunatic decision.
  4. Characterized by lunacy or eccentricity.

derivatives

lúna·tic
noun