skeptic

/ˈskɛptɪk/
noun
  1. A person who questions or doubts claims, statements, or beliefs that are not supported by strong evidence.
    • He is a skeptic when it comes to miracle cures.
    • Even as a skeptic, she was impressed by the magician's trick.
    • The skeptic asked for proof before believing the story.
Antonyms
adjective
  1. Having or showing doubt; questioning the truth of something.
    • The scientist remained skeptic about the new theory until more data was collected.
    • She gave a skeptic look when he said he had seen a UFO.
    • His skeptic attitude made him a careful investor.
Antonyms