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Adjective: intuitive  in't(y)oo-u-tiv
  1. Spontaneously derived from or prompted by a natural tendency
    "an intuitive revulsion"
     
  2. Obtained through intuition rather than from reasoning or observation
    "The detective had an intuitive feeling that the suspect was lying";
    - nonrational, visceral

See also: illogical, self-generated, spontaneous, unlogical [rare]

Encyclopedia: Intuitive