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natural

In a sentence
Dúha je prírodný úkaz.
A rainbow is a natural phenomenon.
Je to úplne prírodné.
It's completely natural.
Zemetrasenia a povodne sú prírodné pohromy.
Earthquakes and floods are natural disasters.
Prírodný park chráni vzácne vtáky.
The nature park protects rare birds.
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.