U0019000 (ŭn′ə-koun′tə-bəl)adj.1. Impossible to account for; inexplicable: unaccountable absences.2. Free from accountability; not responsible: an executive unaccountable to anyone but the president.un′ac·count′a·bil′i·ty n.un′ac·count′a·bly adv.ThesaurusSeeunaccountable