unaccountable /ˌʌnəˈkaʊntəbəl/ adjective /ˌʌnəˈkaʊntəbəl/
adjective
Learner's definition of UNACCOUNTABLE
formal
1
: not able to be explained : strange or mysterious无法解释的;莫名其妙的 2
a : not required to explain actions or decisions(对行为或决定)无须做出解释的 —
usually + to b : not required to be responsible for something无须负责的;没有责任的 —
usually + for