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In a sentence
Zostávať doma je smutné.
It is sad to stay at home.
Smutné vidieť ťa ísť.
Sad to see you go.
Nepozeraj na mňa tak smutne.
Don't give me that sad look.
Prečo ste také smutné?
Why are you so sad?
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.