adjective
showing or demanding excessive delicacy or care; difficult to please; excessively particular, critical, or demanding; hard to please
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The fastidious editor meticulously reviewed each comma and semicolon in the manuscript.
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She's so fastidious about her appearance, always making sure every hair is in place.
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My roommate is super fastidious when it comes to cleaning, she's always scrubbing something.
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His fastidious attention to detail in his artwork is what sets him apart from other artists.