Definition of "skeptic"
skeptic
noun
plural skeptics
Someone who doubts beliefs, claims, plans, etc that are accepted by others as true or appropriate, especially one who habitually does so.
Quotations
But for the fly he might have made me think He had been at his poetry , comparing Nailhead with fly and fly with huckleberry : How like a fly , how very like a fly . But the real fly he missed would never do ; The missed fly made me dangerously skeptic. […]
1997, Robert Faggen, Robert Frost and the Challenge of Darwin, University of Michigan Press, page 98
The official account of this meeting was that it ended in failure, with the Taliban's mullah Omar telling General Ahmed, “Osama will be the last person to leave Afghanistan.” The 9/11 skeptics believe that meeting was meant to fail.
2004, Anthony Lappé, Stephen Marshall, Ian Inaba, True Lies, Plume Books
Even skeptics of the policy acknowledge that the Army conducted an exemplary insourcing program that successfully counteracted the Comptroller's budget ...
2011 June 23, United States House Committee on Small Business, Subcommittee on Contracting and Workforce, Insourcing Gone Awry: Outsourcing Small Business Jobs, page 53
adjective
comparative more skeptic, superlative most skeptic
Quotations
This view of the Great Pyramid is being adopted by a widening circle of Christian believers, until even a skeptic scientist has dignified it as “the religion of the Pyramid!”
1877 November 28, The Lancaster Daily; quoted in Joseph A[ugustus] Seiss, A Miracle in Stone: or The Great Pyramid of Egypt, Philadelphia, Pa.: Porter & Coates, […], 1877, page 239