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In a sentence
Pochybujem, že je to iba náhoda.
I doubt that's just a coincidence.
Pochybujem, že rodený hovoriaci by to tak povedal.
I doubt that a native speaker would say it like that.
To pochybujem.
I doubt it.
Ak pochybuješ o všetkom, pochybuj i o svojich pochybnostiach.
If you're going to doubt everything, at least doubt your doubt.
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.