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In a sentence
Myslí si, že jeho práca je zbytočná.
He thinks his job is pointless.
Je zbytočné kričať o pomoc. Nikto ťa nebude počuť.
There's no use crying for help. No one will hear you.
Je to zbytočné.
It's no use.
Zbytočný spor im pokazil celý večer.
An unnecessary argument spoiled their whole evening.
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.