Unimaginably
/ʌnɪˈmædʒɪnəbli/
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Definition
(adv) To an extent or in a way that cannot be, or could not have been, imagined
Sentence Examples
Under Bouteflika, many corrupt officials became unimaginably rich.
CEFR Practice Quiz
The distance between the two galaxies is ____ large, even for the most advanced scientific instruments to measure today.