This paper examines the emergence, consolidation, and political effects of antigender and trans-exclusionary feminist currents in Brazil between the 2010s and mid2020s, as mapped in Fronteiras Borradas: Movimentos Feministas e de Mulheres e Política Antigênero no Brasil (2025). Drawing on that report’s empirical findings, network analyses, and interviews, this article situates Brazil’s “essentialist” feminisms within the broader transnational wave of anti-gender politics that has reshaped global democratic landscapes. It argues that the Brazilian case exemplifies what Sonia Corrêa calls “the blurring of frontiers” — the diagonal crossings between right-wing, religious, and feminist actors that have rendered the gender question a central battlefield of twenty-first-century reaction.