Adverb
in a fastidious manner
in a fastidious and painstaking manner
Source: WordNethe writes extremely musical music, of which the sound is fastidiously calculated and yet agreeably spontaneous and imaginative Source: Internet
it is almost a waste of time painstakingly to learn the routines of selling Source: Internet
He flips through a few things on her desk, and I spot a list of names crawling down the side of a notebook page in cramped, clear, fastidiously neat handwriting. Source: Internet
‘Henry was fastidiously clean by the standards of the time.’ Source: Internet
Last week, her emails, always fastidiously correct in every way, began to arrive with misspellings and odd spacing. Source: Internet