as in skeptic
a person who is always ready to doubt or question the truth or existence of something a hardheaded unbeliever who demanded to see concrete evidence of any alleged UFO activity

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“Unbeliever.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unbeliever. Accessed 24 Feb. 2024.

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