The research examined whether, and if so how, young adults' trust beliefs in others were associated with interpersonal hostility. The participants in Study 1 were 139 young adults from the UK (76 women; Mage = 20.8). In Study 2, 88 young adult women from the UK (Mage = 21.5) served as participants. The participants completed a standardized measure of trust beliefs in others (total with reliability, honesty, and emotional subscales). In Study 1, participants imagined they were victims of peer provocation. They were required to judge the intention for the provocation and their retaliation to it. In Study 2, the participants were engaged in a lab-based acquaintanceship interaction that involved the exchange of disclosures.They completed an adjective checklist that assessed anger and evaluated the quality of the conversation. Trust beliefs were linearly and negatively associated with the attribution of hostile intentions, retaliation, anger toward others, and critical evaluation of a developing peer relationship. As expected though, quadratic relations were found. Young adults with very low and those with very high trust beliefs (primarily emotionally based) showed greater attribution of hostile intentions, retaliation, anger toward others, and critical evaluation of a developing peer relationship than did young adults with the middle range of trust beliefs. The linear relations supported the hypothesis that trust promotes psychosocial adjustment.The quadratic relations supported the deviation from the normative trust (centralist) approach primarily for emotional trust beliefs in others.anger, attribution of hostile intentions, critical evaluation of peer relationships, retaliation, trust beliefs, young adults The principle that trust promotes psychosocial adjustment (TPPA) is the cornerstone of Attachment Theory (Cohn, 1990;De Winter et al., 2016), Generalized Expectancy Theory (Rotter, 1980), and Social Capital Theory (Cozzolino, 2011. As support for the TPPA, individuals' trust beliefs in others have been found to be concurrently and prospectively associated with prosocial behavior (Malti et al., 2016), lower levels of internalized psychopathology, and lower levels of externalized psychopathology (Malti et al., 2013;Rotenberg et al., 2005). The contrasting Centralist Approach to Trust (CAT) conceptualizes trust as a continuum in which deviation from normative patterns of trust beliefs and behavior results in psychosocial maladjustment (Rotenberg, unpublished). CAT is supported by quadratic relations in which children and early adolescents with very high trust and those with very low beliefs in others demonstrate greater psychosocial maladjustment (e.g., retaliatory aggression) than those with the middle range of trust beliefs in others (Rotenberg et al., 2013).The current research was designed to further investigate the contrasting TPPA and CAT hypotheses. The research examined whether there were linear and curvilinear relations between trust