<p><strong>Noun</strong></p><ul><li>a person who does not accept a particular faith, especially Christianity or Islam</li><li>a person who has no religious faith; unbeliever</li><li>(loosely) a person who disbelieves or doubts a particular theory, belief, creed, etc.; skeptic</li></ul><p><strong>Adjective</strong></p><ul><li>not accepting a particular faith, especially Christianity or Islam</li><li>without religious faith</li><li>of, relating to, or characteristic of unbelievers</li><li>relating to or showing unbelief</li></ul>