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In a sentence
Čas nebadane plynul počas dlhého rozhovoru.
Time passed unnoticed during the long conversation.
Dieťa nebadane odišlo z izby.
The child slipped out of the room unnoticed.
Jej úsmev sa nebadane zmenil na smiech.
Her smile imperceptibly turned into laughter.
Počas čítania sa nebadane zotmelo.
It grew dark unnoticed while I was reading.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.