1. a person who questions or doubts the truth of something
2. a person who maintains a doubting attitude toward values, plans, or the character of others
3. a person who doubts the truth of a religion, especially Christianity

Examples

• She was a skeptic about the new diet plan’s effectiveness.
• The scientist remained a skeptic until he saw the experimental results.
• Many skeptics questioned the politician’s campaign promises.
• He’s a natural skeptic who doesn’t believe anything without proof.
• The skeptic demanded more evidence before accepting the theory.
• As a religious skeptic, she found it hard to accept faith-based arguments.