Source : Webster's Revised Unabridged Dictionary (1913)

Skeptic \Skep"tic\, Skeptical \Skep"tic*al\, a. [Written also
   sceptic, sceptical.]
   1. Of or pertaining to a sceptic or skepticism; characterized
      by skepticism; hesitating to admit the certainly of
      doctrines or principles; doubting of everything.

   2. (Theol.) Doubting or denying the truth of revelation, or
      the sacred Scriptures.

            The skeptical system subverts the whole foundation
            of morals.                            --R. Hall.
      -- {Skep"tac*al*ly}, adv. -- {Skep"tic*al*ness}, n.