Unaccountable
/ˌʌnəˈkaʊntəbəl/
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Definition
(adj) Inexplicable; unable to be accounted for or explained.
Sentence Examples
Your movements were unaccountable.
He knew it was so, with an unaccountable but instantaneous certainty.
CEFR Practice Quiz
His sudden change of mind was completely ____ to his friends, as he had always expressed very different views today.