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Adjective: incredulous  in'kred-yu-lus or in'kre-ju-lus
  1. Not disposed or willing to believe; unbelieving
    "The movie's unlikely happy ending came to pass as the result of an incredulous series of lucky accidents"

See also: disbelieving, distrustful, incredible, sceptical [Brit, Cdn], skeptical [N. Amer], unbelievable, unbelieving

Antonym: credulous