1. Denying or questioning the tenets of especially a religion
   "a sceptical approach to the nature of miracles"
   - disbelieving, skeptical [N. Amer], unbelieving 
2. Marked by or given to doubt
   "a sceptical attitude"; "a sceptical listener"
   - doubting, questioning, skeptical [N. Amer]

See also: distrustful, incredulous, sceptic [Brit, Cdn], sceptically [Brit, Cdn], scepticism [Brit, Cdn]

Encyclopedia: Sceptical

• listed security
• listen
• listen in
• listen up
• listener
• listening
• listening watch
• lister
• lister plough
• lister plow
• Listera
• Listera convallarioides
• Listera cordata
• Listera ovata
• listeria
• listeria meningitis
• Listeria monocytogenes
• listeriosis
• listing
• listless
• listlessly
• listlessness
• Liston
• Lisu
• Liszt