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Adjective: visceral  vi-su-rul
  1. Relating to or affecting the viscera
    "visceral bleeding";
    - splanchnic
     
  2. Obtained through intuition rather than from reasoning or observation
    "The detective had a visceral feeling that the suspect was lying";
    - intuitive, nonrational

See also: illogical, unlogical [rare]

Encyclopedia: Visceral