extramarital

/ˌɛkstrəˈmɛrɪtəl/
adjective
  1. Occurring outside a marriage; relating to a romantic or sexual relationship with someone other than one's spouse.
    • The novel explores the consequences of an extramarital affair.
    • They sought counseling after the extramarital relationship was discovered.
    • Extramarital relationships often cause deep emotional pain for all involved.
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