unaccountable

Universal Words adjective (written) 1 impossible to understand or explain SYNINEXPLICABLE: There has been an unaccountable increase in cases of the disease. * For some unaccountable reason, the letter never arrived. 2 ~ (to sb/sth) not having to explain or give reasons for your actions to anyone: Too many government departments are unaccountable to the general public. OPPACCOUNTABLE