unaccountableEnglishOxford New American Dictionaryunaccountable /ˌənəˈkoun(t)əb(ə)l, ˌənəˈkaʊn(t)əb(ə)l / ▸ adjective 1 unable to be explained: a strange and unaccountable fact. ▪ (of a person or their behavior) unpredictable and strange: he was not only the most charismatic man she'd ever met, but also the most complex and unaccountable. 2 (of a person, organization, or institution) not required or expected to justify actions or decisions; not responsible for results or consequences: there are enormous risks in leaving such agencies uncontrolled and unaccountable a powerful and unaccountable institution. – DERIVATIVES unaccountability /ˌənəˌkoun(t)əˈbilədē, ˌənəˌkaʊn(t)əˈbɪlədi / noun,unaccountableness ,unaccountably /ˌənəˈkoun(t)əblē, ˌənəˈkaʊn(t)əbli / adverb