| 1. | a person who questions the validity or authenticity of something purporting to be factual. |
| 2. | a person who maintains a doubting attitude, as toward values, plans, statements, or the character of others. |
| 3. | a person who doubts the truth of a religion, esp. Christianity, or of important elements of it. |
| 4. | (initial capital letter ) Philosophy.
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| 5. | pertaining to skeptics or skepticism; skeptical. |
| 6. | (initial capital letter ) pertaining to the Skeptics. |