This study examined rumination, conflict intensity, and perceived resolvability as predictive of factors that sustain serial arguments. Young adults reported on serial arguments in either parent-child or romantic relationships. In parent-child relationships, perceived resolvability was inversely related to the likelihood of continuing a serial argument, unless the argument was high in intensity and rumination, or low in intensity and rumination. In dating relationships, partners were more motivated about the argument when they were either (a) ruminating about the issue but did not view it as resolvable, or (b) when they believed the argument to be resolvable but did not ruminate about it. Collectively, the results identify factors that contribute meaningful variance to understudied aspects of serial arguments.Scholars have devoted the better part of 2 decades documenting the prevalence, antecedents, and consequences of serial arguments in personal relationships (e.g.,