Definition of "sceptick"

And what happineſs is there in a ſtorm of paſſions? On this account the Scepticks affected an indifferent æquipondious neutrality as the only means to their Ataraxia, and freedom from paßionate diſturbances.

1665, Joseph Glanvill, chapter XXVII, in Scepsis Scientifica: Or, Confest Ignorance, the Way to Science; in an Essay of the Vanity of Dogmatizing, and Confident Opinion with a Reply to the Exceptions of the Learned Thomas Albius‎, London: E. Cotes, page 168

That there may be Certainty upon an infallible Evidence in Matters of Science, I readily grant you. But since there once were Scepticks in Philosophy as well as Religion, such as doubted of every thing, I very much question, whether the whole World be agreed in this Point; unless you could assure me, that Race of Seekers is now extinct.

1720, Samuel Fancourt, “The Remarker's second Objection produced and examined”, in An Essay Concerning Certainty and Infallibility: Or, Some Reflections Upon a Pamphlet Stiled, “The Nature and Consequences of Enthusiasm Considered, in Some Short Remarks on the Doctrine of the Blessed Trinity Stated and Defended.” In a Letter to the Author of Those Remarks‎, London: R. Cruttenden, page 35