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In a sentence
Zlé počasie nepriaznivo ovplyvnilo úrodu.
Bad weather affected the harvest unfavorably.
Nové pravidlá sa nepriaznivo dotkli malých obchodov.
The new rules affected small shops adversely.
Na výsledok skúšky nepriaznivo pôsobil nedostatok spánku.
Lack of sleep had an unfavorable effect on the exam result.
Trh sa po tejto správe vyvíjal nepriaznivo.
The market developed unfavorably after this news.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.