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unbelievable
In a sentence
Neuveriteľné!
Unbelievable!
To je neuveriteľné!
It's unbelievable.
Si neuveriteľne krásna.
You're incredibly beautiful.
Tom je neuveriteľne nadaný.
Tom is incredibly talented.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Includes Tatoeba example sentences when present.
Full attribution on References.