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In a sentence
Je to pomerne nečakané.
That is rather unexpected.
Narazil na nečakané prekážky.
He encountered unexpected obstacles.
Bolo to nečakané.
It was unexpected.
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.