Abstract. This study examines attitudes toward English and local languages among bilingual postgraduate students of English as a Foreign Language (EFL) in Indonesia, and how these attitudes relate to language use and identity construction. Using a convergent parallel mixed-methods design, data were collected from 35 postgraduate students in Master of English Language Education programs at two universities. Quantitative data came from Likert-scale items measuring cognitive, affective, and behavioral orientations; qualitative data came from open-ended responses analyzed thematically. Participants held very positive attitudes toward English (M = 4.50, SD = 0.38) and positive attitudes toward local languages (M = 4.16, SD = 0.63), with a statistically significant difference favoring English, t(34) = 3.13, p = .004, Cohen's d = 0.53, indicating hierarchical coexistence rather than language displacement. Within each language, a further pattern emerged: English showed high cognitive-affective endorsement but comparatively lower behavioral confidence (Q11 vs. Q13, t(34) = 8.10, p < .001, d = 1.37), while local languages showed high identity-related endorsement but comparatively lower reported functional use (Q16 vs. Q18, t(34) = 4.37, p < .001, d = 0.74). We refer to this descriptive cross-language pattern as mirrored non-congruence, a label for the empirically observed alignment of two previously documented forms of attitudinal divergence, rather than a claim of new theory. Findings support pedagogy that treats students' full multilingual repertoire as an asset rather than interference.Keywords: Bilingual Postgraduate EFL; Code-Switching; Indonesia; Language Prestige; Mirrored Non-Congruence; Translanguaging
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