prominent health threats (WHO, 2020). Past research suggested that vaccine hesitancy depends on different causes, including demographics, knowledge about the virus and vaccine, past infection, religious and political interests as well as individual dispositions, such as personality (e.g., Murphy et al., 2021; Shachman et al., 2021). This latter has been widely conceptualised as a hard-core and relatively stable variable involving biological, social (i.e., norms, values, roles, and authority), and intrapsychic factors determining, causing, and explaining people's behaviours (DeYoung, 2010;Dwairy, 2002), including protective practices against the COVID-19 (Reagu et al., 2023). For instance, Abdelrahman (2022) found that Conscientiousness and Neuroticism were positively associated, while Agreeableness was negatively related to personal hygiene practices and social distancing. It is worth noting that research on the association between personality and healthy behaviours against COVID-19 has been overwhelmed by the Big Five model (Reagu et al., 2023;Abdelrahman, 2022), whereas little empirical evidence has been collected on other personality taxonomies, such as the Dark Triad (DT). This personality model reflects a constellation of three theoretically distinctive yet interconnected personality traits (i.e., psychopathy,