fastidiously

Adverb
  1. In a fastidious and painstaking manner (synset 400418463)
    "it is almost a waste of time painstakingly to learn the routines of selling"
  2. In a fastidious manner (synset 400339405)
    "he writes extremely musical music, of which the sound is fastidiously calculated and yet agreeably spontaneous and imaginative"

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