painstakingly
/ˈpeɪnˌsteɪkɪŋli/ adverb C2- In a painstaking manner; very slowly and carefully.
From the library
As they traversed the sweeping expanses of the Great Plains and the formidable elevations of the Rocky Mountains, they painstakingly recorded hundreds of previously undocumented species.
She wondered what the author would think of the rhythmic cadences she had painstakingly constructed from his originally staccato phrasing.
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