Definition of "sceptic"

Not long since O’Connell beat the sceptic geologists of the British Association of nonsense and “science” all to nothing by a discovery of fossil Whigs—very extraordinary and ferocious creatures they must have been in their day, which, of course, was far anterior to the creation of the world, according to the Mosaic account, which the bone-grubbing “philosophers” of the chalk formations have so properly exploded.

1839 September 14, “Morning Newspapers. (From the Morning Herald.)”, in The Standard‎, number 4754

The black race, much inferior to the Arab in intellectual power and in steadiness of will, are at the same time free from the sceptic distrustfulness and deep jealousy so common among their white fellow-citizens.

1865, William Gifford Palgrave, “Life at Riaḍ”, in Narrative of a Year’s Journey Through Central and Eastern Arabia (1862-63), volume II, London, Cambridge: Macmillan and Co., page 3

As I said, my experience was: I travelled to Russia as a sceptic person and I returned as a European.

2015, Milo Rau, “Pussy Riot’s Moscow Trials: Restaging Political Protest and Juridical Metaperformance”, in Alex Flynn, Jonas Tinius, editors, Anthropology, Theatre, and Development: The Transformative Potential of Performance, Palgrave Macmillan, part II (Theatre as Paradigm for Social Reflection: Conceptual Perspectives), section 2 (Political Theatricality), page 283