Results from our second study revealed that brooding statistically predicted risk for suicidal behavior regardless of reflection levels, and this relationship was mediated by lack of premeditation and lack of perseverance. In contrast, reflection did not predict risk for suicidal behavior, when adjusting for brooding. The present studies are the first to establish a relationship between brooding, specifically, and trait impulsivity in the forms of negative urgency, lack of premeditation, and lack of perseverance.