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In a sentence
Povedal to namáhavo.
He said it strenuously.
Pri práci postupovala namáhavo.
She worked strenuously.
Na otázku reagoval namáhavo.
He responded to the question strenuously.
Celý deň sa správal namáhavo.
He behaved strenuously all day.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.