1. the action or state of being unfaithful to a spouse or other sexual partner
2. disbelief in a particular religion, especially Christianity
Usage: formal

Examples

• The marriage ended due to his infidelity.
• She discovered evidence of her husband’s infidelity.
• Infidelity can cause deep emotional pain in relationships.
• The couple sought counseling after the infidelity was revealed.
• In some cultures, infidelity is considered a serious crime.
• The novel explores themes of love, betrayal, and infidelity.