Inconceivable
/ˌɪnkəˈnsivəbəl/
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Definition
(adj) Unable to be conceived or imagined; unbelievable.
Sentence Examples
A few years ago it would have been inconceivable for Japan to send troops overseas.
It is inconceivable to me that he would do such a thing.
CEFR Practice Quiz
It was once ____ that people would be able to communicate instantly across the entire world.