1. Denying or questioning the tenets of especially a religion
   "a skeptical approach to the nature of miracles"
   - disbelieving, sceptical [Brit, Cdn], unbelieving 
2. Marked by or given to doubt
   "a skeptical attitude"; "a skeptical listener"
   - doubting, questioning, sceptical [Brit, Cdn]

See also: distrustful, incredulous, skeptic [N. Amer], skepticism [N. Amer]

Encyclopedia: Skeptical

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