inconceivably

🇺🇸 /ˌɪnkənˈsiːvəbli/ 🇬🇧 /ˌɪnkənˈsiːvəbli/
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adverb
R

to an extent that is very surprising or hard to imagine

The size of the universe is inconceivably vast, stretching far beyond what we can see with our telescopes.

translation

adv. to an extent that is very surprising or hard to imagine