(Latin: loathing, disgust, excessively critical, fussy, hard to please)

fastidious (fuh STID ee uhs) (adjective), more fastidious, most fastidious
1. Referring to a person who is meticulous and pays great attention to details: James was a fastidious accountant who seemed to be destined to do well in the financial department of his company.
2. Characterizing someone who is difficult to please or is exacting: Mark was a fastidious person who felt disgusted about the lack of neatness that was shown by those who don't wear proper clothing where they are working.
3. Descriptive of an individual who is excessively particular, critical, or demanding; especially, in matters of taste or propriety: Fastidious people are difficult to please because they are overly attentive to details or appearances.
4. In microbiology, pertaining to a single-celled life form that has precise and complicated nutritional requirements: In her biology class at school, Susan learned that some tiny microorganisms are very fastidious in that they can only grow in a very specific and enriched environment.
5. Etymology: from Latin fastidiosus, "squeamishness, disgust, haughtiness, disdain"; from fastidium, a loathing; from fastus, "disdain".

Fastidious originally meant: "disagreeable, distasteful" then later it changed to "disgusted".

Pertaining to being very critical.
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A reference to someone who is particular about form.
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fastidiously (adverb), more fastidiously, most fastidiously
Descriptive of someone who is hard to please: James, an accountant, was fastidiously examining the financial expenses that his company had to pay.

Having a sense of humor and looking to the future, the author's work fastidiously included a regard for details and superior writing skills.

fastidiousness (s) (noun) (no plural)
1. The trait of being meticulous about matters of taste or style: Frank is known for his fastidiousness as a reporter for his newspaper.
2. The character or quality of being overly particular about style, taste, appetite, etc.: Carl has too much fastidiousness to do anything that might get him dirty.
ultrafastidious (adjective), more ultrafastidious, most ultrafastidious
1. Conveying an extremely greater attention to details or very particular and demanding about issues of taste or standards of good behavior and what is the proper way to do something.
2. Etymology: from Latin ultra, "beyond" + fastidiosus, "disgust, disdain, haughtiness, loathing".
ultrafastidiously (adverb), more ultrafastidiously, most ultrafastidiously
Characteristic of being more excessive to an extremely greater degree: Frank worked for a tax consultant who required his employees to ultrafastidiously investigate the accuracy of taxpayer's claims.