Attributing negative categories such as 'weak' to pupils is a common practice in Sweden and a known phenomenon worldwide. While there has been a substantial amount of research on different expressions of 'deviance' in the educational arena, the research on how teachers communicate about pupils as 'weak' is scarce. In this study, teachers' communication about pupils as 'weak' is examined in dialogues produced in focus group discussions by 29 teachers in six different Swedish compulsory schools. Through the lens of social representations theory and a dialogical perspective, this study suggests that 'weak pupil' as a social representation can be characterized by a range of different and sometimes contradicting themes and mainly two themata: normal/deviant and nature/nurture. The results show that 'weak pupil' is used as a multifaceted communicative resource to describe pupils who do not perform according to schools' expectations. In contrast to several previous studies, the use of 'weak pupil' is partially challenged by participants who, to some extent, place perceived problems within the educational institution instead of the individual pupil. The study has implications for the understanding of how perceptions of normality might be perceived and collectively (re)produced in communication about pupils as well as for future research using social representations theory within the educational field.