Polygynous marriage is prevalent among Israel’s Bedouin-Arab community, despite being explicitly banned by state law. Cultural traditions and customs permit men to take multiple wives, and Islamic teachings do not prohibit the practice. The impact of polygyny is significant, affecting women, children, and society as a whole in various ways. We examined the connections that attachment anxiety and attachment avoidance had with hypothetical responses to the potential threat of polygynous marriages in a community sample of young unmarried Israeli Bedouin-Arab women (n = 306). Participants were randomly assigned to imagine either a high-threat scenario (i.e., finding that their husband decided to take a second wife; n = 151) or a low-threat scenario (i.e., their husband would not decide to take a second wife; n = 155) and report their anticipated responses to these scenarios. Results showed that attachment anxiety was positively associated with anticipated negative emotional responses in the high-threat condition but not in the low-threat condition. However, neither attachment anxiety nor attachment avoidance were associated with the perceived threat of polygyny to their marriage. The findings of this study suggest that attachment styles play a significant role in shaping women’s perceptions and reactions to hypothetical polygynous marriages. Women with anxious attachment styles are more likely to experience intensified negative emotions regarding such marriages, while those with avoidant attachment styles may display greater tolerance toward polygyny. These results highlight the need for tailored interventions and support systems that take into account individual psychological profiles as well as the broader cultural context of Israeli Bedouin-Arab society.