fastidious

Etymology

From Latin fastīdiōsus (“passive: that feels disgust, disdainful, scornful, fastidious; active: that causes disgust, disgusting, loathsome”), from fastīdium (“a loathing, aversion, disgust, niceness of taste, daintiness, etc.”), perhaps for *fastutidium, from fastus (“disdain, haughtiness, arrogance, disgust”) + taedium (“disgust”). Cf. French fastidieux.

adj

1. Excessively particular, demanding, or fussy about details, especially about tidiness and cleanliness.
   He had at first tried to clean up as they ate, his fastidious nature kicking in, but Chris had told him to just stop, he was blocking the TV. 2003, Lynsay Sands, Single White Vampire
   As she cleaned the room daily, she knew it was against his fastidious nature to bring or have food in his room. 2004, Maria Osborne Perr, Ravished Wings
   His fastidious nature had been evident in his careful snipping of a customer's hair and now he guided his pencil with the same adroitness. 2008, Robert Fisher, Memory Road
2. Overly concerned about tidiness and cleanliness.
   If you are fastidious, clean previously used pots inside and out; if not, merely clean the outside (unless you are battling a pest infestation; then the inside will need scrubbing as well). 2010, Debra Lee Baldwin, Succulent Container Gardens: Design Eye-Catching Displays with 350 Easy-Care ...
3. Difficult to please; quick to find fault.
   "It's burn[t], M'sieur," said Marie Louise, politely, but decidedly, to the utter confusion of Mr. Billy, who was as mortified as could be at the failure of his dinner to please his fastidious little visitor. 1897, Kate Chopin, The Lilies