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In a sentence
Dobrovoľne pomáha v útulku.
She volunteers at an animal shelter.
Nikto ho nenútil, odišiel dobrovoľne.
No one forced him; he left voluntarily.
Dobrovoľne som sa prihlásil na kurz.
I signed up for the course voluntarily.
Deti dobrovoľne upratali izbu.
The children cleaned their room willingly.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.