fas·tid·i·ous adjective \fa-ˈsti-dē-əs, fə-\: very careful about how you do something: liking few things : hard to please: wanting to always be clean, neat, etc.
1. archaic: scornful. 2 a: having high and often capricious standards : difficult to please <critics … so fastidious that they can talk only to a small circle of initiates — Granville Hicks>. b: showing or demanding excessive delicacy or care.
c: reflecting a meticulous, sensitive, or demanding attitude <fastidious workmanship>. 3: having complex nutritional requirements <fastidious microorganisms>.
— fas·tid·i·ous·ly adverb
— fas·tid·i·ous·ness noun
Synonyms
- choosy (or choosey), dainty, delicate, demanding, exacting, finicky, finical, finicking, fussbudgety, fussy, nice, old-maidish, particular, pernickety [chiefly British], persnickety, picky
Definition source: http://www.merriam-webster.com
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Melissa Janda - A Time to Write 
One of my favourite words. I really should use it more often.
I love this one too. My son learned it in 4th grade and now it always makes me think of him. The teacher used my son as an example when using it in a sentence. He’s a little bit of a neat freak 🙂