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In a sentence
Tento dáždnik je nanič.
This umbrella is no good.
Bez nabíjačky je telefón nanič.
Without a charger, the phone is useless.
Celý plán bol nakoniec nanič.
The whole plan was useless in the end.
Keď prší, otvorené okno je nanič.
When it rains, an open window is no good.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.