( BrE ) ( NAmE skep·tic ) / ˈskeptɪk; NAmE / noun
a person who usually doubts that claims or statements are true, especially those that other people believe in
—see also Euro-sceptic
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WORD ORIGIN
late 16th cent. (in a philosophical sense): from French sceptique , or via Latin from Greek skeptikos , from skepsis inquiry, doubt.