unaccountableEnglishOxford Dictionary of Englishunaccountable /ˌʌnəˈkaʊntəbl / ▸ adjective 1 unable to be explained: a strange and unaccountable fact. ▪ (of a person or their behaviour) 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 /ˌʌnəˌkaʊntəˈbɪlɪti / noun unaccountableness /ˌʌnəˈkaʊntəblnəs / noun unaccountably /ˌʌnəˈkaʊntəbli / adverb