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