Unthinkably
/ʌnˈθɪŋkəbli/
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Definition
(adv) In an unthinkable manner.
Sentence Examples
The task was unthinkably hard for a person with no experience.
To act unthinkably means to act in a way that is very shocking.
CEFR Practice Quiz
The amount of data generated by the new system is ____ large, and it requires a massive server to store it all today.