1. excessively particular, critical, or demanding; hard to please: a fastidious eater.
  2. requiring or characterized by excessive care or delicacy; painstaking.


  1. very critical; hard to please
  2. excessively particular about details
  3. exceedingly delicate; easily disgusted

mid-15c., “full of pride,” from Latin fastidiosus “disdainful, squeamish, exacting,” from fastidium “loathing, squeamishness,” most likely from *fastu-taidiom, a compound of fastus “contempt, arrogance” and taedium “aversion, disgust.” Early use in English was both in passive and active senses. Meaning “squeamish, over-nice” emerged in English 1610s. Related: Fastidiously; fastidiousness.


  1. Possessing or displaying careful, meticulous attention to detail.
  2. Difficult to please; exacting.
  3. Having complex nutritional requirements. Used of microorganisms.
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