skeptic

Noun
  1. Someone who habitually doubts accepted beliefs (synset 110624042)
    is a type of: intellect, intellectual - a person who uses the mind creatively
    subtypes:
    • doubting thomas - someone who demands physical evidence in order to be convinced (especially when this demand is out of place)
    • pessimist - a person who expects the worst
    same as: doubter, sceptic

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