This study explores Taiwanese junior high school social studies teachers' definitions of sustainability, using a qualitative semi-structured interview approach. Three themes explaining these teachers' definitions are cycling, cultural sustainability, and balancing, harmony, and coexisting. These definitions unveil an alternative worldview that is non-Eurocentric-based and multifaceted dimensions of sustainability. Findings suggest that instead of claiming that we should have a consistent definition to guide teachers to implement environmental and sustainability education across different subjects, it is important to acknowledge the fact that teachers trained in different disciplines and of different cultural backgrounds need a whole range of support to incorporate sustainability goals successfully in their teaching. Supported by results of this study, social studies teachers can reasonably support the teaching of controversial issues about tensions between cultural sustainability and economic development.