This study incorporates communication accommodation theory to investigate how student perceptions of instructor nonaccommodation influence affective and cognitive classroom outcomes. A series of two-level hierarchical linear models (students nested within instructors) revealed significant, negative associations between specific modes of instructor nonaccommodation (i.e., nonaccommodation related to nonverbal responsiveness, content knowledge, and student support) and students' reported outcomes. Specifically, nonaccommodation related to nonverbal responsiveness and student support resulted in less communication satisfaction and instructor-student rapport when controlling for student sex and expected grade in a course. Contrarily, only nonaccommodation related to content knowledge predicted processing fluency. The research provides instructional communication researchers with a unique theoretical framework for conceptualizing and assessing student perceptions while also raising important questions regarding how students prioritize effective teaching behaviors in context. Practical implications are provided for how instructors better assess and enact behavior relative to individual student needs.