FASTIDIOUSLY
fastidiously
(adverb) in a fastidious manner; “he writes extremely musical music, of which the sound is fastidiously calculated and yet agreeably spontaneous and imaginative”
painstakingly, fastidiously
(adverb) in a fastidious and painstaking manner; “it is almost a waste of time painstakingly to learn the routines of selling”
Source: WordNet® 3.1
Etymology
Adverb
fastidiously (comparative more fastidiously, superlative most fastidiously)
In a fastidious manner
Source: Wiktionary
FASTIDIOUS
Fas*tid"i*ous, a. Etym: [L. fastidiosus disdainful, fr. fastidium
loathing, aversion, perh. fr. fastus arrogance (of uncertain origin)
+ taedium loathing. Cf. Tedious, Fash.]
Definition: Difficult to please; delicate to fault; suited with difficulty;
squeamish; as, a fastidious mind or ear; a fastidious appetite.
Proud youth ! fastidious of the lower world. Young.
Syn.
– Squeamish; critical; overnice; difficult; punctilious.
– Fastidious, Squeamish. We call a person fastidious when his taste
or feelings are offended by trifling defects or errors; we call him
squeamish when he is excessively nice or critical on minor points,
and also when he is overscrupulous as to questions of duty. "Whoever
examines his own imperfections will cease to be fastidious; whoever
restrains his caprice and scrupulosity will cease to be squeamish."
Crabb.
– Fas*tid"i*ous*ly, adv.
– Fas*tid"i*ous*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition