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In a sentence
Lekár upozornil na závažný problém.
The doctor warned about a serious problem.
Závažná chyba v zmluve spôsobila oneskorenie.
A serious error in the contract caused a delay.
Lekár hovoril o závažnom riziku komplikácií.
The doctor spoke about a serious risk of complications.
Lekár potvrdil závažný nedostatok železa.
The doctor confirmed a serious iron deficiency.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.