/ fæˈstɪdiəs; NAmE / adjective
1.
being careful that every detail of sth is correct
SYN meticulous :
Everything was planned in fastidious detail.
He was fastidious in his preparation for the big day.
2.
(sometimes disapproving ) not liking things to be dirty or untidy :
She wasn't very fastidious about personal hygiene.
► fas·tidi·ous·ly adjective
► fas·tidi·ous·ness noun [ U ]
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WORD ORIGIN
late Middle English : from Latin fastidiosus , from fastidium loathing. The word originally meant disagreeable , later disgusted . Current senses date from the 17th cent.