From Latin *scepticus, only in plural Sceptici (“the sect of Skeptics”), from Ancient Greek σκεπτικός (skeptikos, “thoughtful, inquiring”), from σκέπτομαι (skeptomai, “I consider”), compare to σκοπέω (skopeo, “I view, examine”).
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Alternative forms 
- sceptic (Commonwealth English)
skeptic (plural skeptics)
- Someone who habitually doubts beliefs and claims presented as accepted by others, requiring strong evidence before accepting any belief or claim.
- Someone undecided as to what is true.
- A type of agnostic
Related terms 
- skeptic in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- skeptic in The Century Dictionary, The Century Co., New York, 1911
- skeptic at OneLook Dictionary Search