Source : Webster's Revised Unabridged Dictionary (1913)

Sceptic \Scep"tic\, Sceptical \Scep"tic*al\, Scepticism
\Scep"ti*cism\,
   etc. See {Skeptic}, {Skeptical}, {Skepticism}, etc.

Source : WordNet®

sceptic
     n : someone who habitually doubts accepted beliefs [syn: {skeptic},
          {doubter}]