1. acts of being unfaithful to a spouse or romantic partner
2. acts of disloyalty or betrayal of trust or duty

Examples

• The marriage ended due to his repeated infidelities.
• She discovered evidence of her husband’s infidelities in his phone.
• The novel explores themes of love, betrayal, and marital infidelities.
• His infidelities to the company’s values cost him his job.
• The politician’s infidelities to his campaign promises angered voters.
• Trust was broken by a series of small infidelities over time.