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certain
In a sentence
V určitom momente odišiel.
At a certain moment he left.
Tom určite nehovorí za nás všetkých.
Tom certainly doesn't speak for all of us.
Klingončina je určite najmenej užitočný jazyk.
Klingon has to be the most useless language.
Určite by som tam nešiel sám.
I definitely wouldn't go there by myself.
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.