The present study aims to investigate how positive (happiness) and negative (sadness and aggression) emotions from an inauthentic leader could affect followers efficacy perception, ethical judgment and personal identification when they note an unethical speech given by this professional. Thus, by experiment methodology, it sought to analyse how the effect of emotional expressions of this toxic leader could influence the evaluation that his team would have on him in contemporary organizations. Through a sample collected from 275 business administration undergraduates, the results confirmed that inauthentic leaders who express positive emotions received better evaluations of his followers as their efficacy perception and personal identification of those who manifest negative emotions. Finally, both positive and passive negative emotions (sadness) expressed by these leaders received more favourable ethical judgments of the followers in relation to aggressive negative emotions.