adjective
1.
Synonyms: inexplicable , inexplainable, unexplainable
Antonyms: accountable
2.
Synonyms: mysterious , arcane, cabalistic, impenetrable, inscrutable, mysterial, mystic, numinous, unguessed, unknowable
UNACCOUNTABLE
Meaning of UNACCOUNTABLE in English
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003