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useful
In a sentence
Klingončina je určite najmenej užitočný jazyk.
Klingon has to be the most useless language.
Môj počítač musí byť na niečo užitočný.
My computer has got to be useful for something.
Dáždnik je užitočný v miernom daždi, no keď leje ako z krhly, veľmi nepomôže.
An umbrella is useful in a mild rain, but when it rains cats and dogs an umbrella is of little help.
Tom je užitočný idiot.
Tom is a useful idiot.
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.