[syn: disbelieving, skeptical, sceptical, unbelieving]
The Collaborative International Dictionary of English v.0.48:
Sceptic \Scep"tic\, Sceptical \Scep"tic*al\, Scepticism
\Scep"ti*cism\, etc.
   See Skeptic, Skeptical, Skepticism, etc.
   [1913 Webster]
WordNet (r) 3.0 (2006):
sceptical
    adj 1: marked by or given to doubt; "a skeptical attitude"; "a
           skeptical listener" [syn: doubting, questioning,
           skeptical, sceptical]
    2: denying or questioning the tenets of especially a religion;
       "a skeptical approach to the nature of miracles" [syn:
       disbelieving, skeptical, sceptical, unbelieving]