fastidious
US /fæsˈtɪd.i.əs/
UK /fæsˈtɪd.i.əs/
1.
very attentive to and concerned about accuracy and detail
:
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She is fastidious about her appearance.
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The architect was fastidious in his attention to every detail of the building's design.
2.
difficult to please; having high and often unachievable standards
:
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He is a fastidious eater and rarely tries new foods.
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The professor was known for his fastidious standards when grading papers.