adverb
1. in a fastidious and painstaking manner
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it is almost a waste of time painstakingly to learn the routines of selling
• Syn: ↑painstakingly
• Derived from adjective: ↑fastidious, ↑painstaking (for: ↑painstakingly)
2. in a fastidious manner
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he writes extremely musical music, of which the sound is fastidiously calculated and yet agreeably spontaneous and imaginative
• Derived from adjective: ↑fastidious
Useful english dictionary. 2012.