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voluntary
In a sentence
Moja staršia sestra je dobrovoľná hasička.
My older sister is a volunteer firefighter.
Dobrovoľná zbierka pomohla opravám detského ihriska.
The voluntary collection helped repair the playground.
Práca v útulku je dobrovoľná a veľmi potrebná.
Work at the shelter is voluntary and much needed.
Dobrovoľný hasič pomáhal pri povodni.
A volunteer firefighter helped during the flood.
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.