1. a person who does not believe in a particular religion or religious doctrine
2. a person who doubts or refuses to accept something as true

Examples

• The missionary tried to convert the unbelievers in the village.
• She remained an unbeliever despite her family’s strong religious faith.
• The scientist was an unbeliever in supernatural explanations.
• Many unbelievers attended the interfaith dialogue to learn about different perspectives.
• He was labeled an unbeliever for questioning the company’s claims.
• The debate attracted both believers and unbelievers from the community.
• As an unbeliever in conspiracy theories, she demanded evidence.