What does fastidious mean?
Fastidious describes someone who shows extreme care and attention to detail — about cleanliness, correctness, appearance, or quality. A fastidious person may be admired for high standards or teased for being fussy, since the word can imply either admirable thoroughness or excessive pickiness that makes others impatient. In modern usage it most often appears in contexts like grooming, editing, craftsmanship, and housekeeping: a fastidious editor polishes every sentence, while a fastidious guest notices a smudged glass at dinner. The word derives from Latin "fastidium," meaning loathing or disdainful dislike, which explains why fastidiousness can shade into squeamishness or contempt. It is a formal but widely used term, valuable precisely because it captures this double edge — praise and mild criticism in a single adjective. Related forms include the adverb "fastidiously" and the noun "fastidiousness."
adjectiveVery attentive to and concerned about accuracy, cleanliness, or detail; excessively particular and hard to please.
- Showing great attention to detail, cleanliness, or correctness; meticulous to the point of being hard to please.
- (Less common) Disdainfully picky or squeamish; easily disgusted.
"A fastidious editor, she caught errors no one else noticed."
"He was fastidious about his appearance, pressing his shirts every morning."
"The fastidious restorer spent months cleaning dust from the fresco with a fine brush."
"Fastidious" comes from the Latin "fastidium," meaning loathing or disgust — the word literally traces back to a feeling of distaste.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fastidious
Fastidious comes from Latin "fastidiosus," derived from "fastidium," meaning loathing, disdain, or weariness of something. It entered English in the early 15th century, initially carrying a stronger sense of scornful distaste before evolving toward its modern emphasis on scrupulous, exacting care. It shares its Latin root lineage with related notions of disdain rather than with other common English words of distinct origin.
Related word forms
How fastidious is actually used
Formal-leaning register but common in everyday writing. The tone can be admiring (praising careful standards) or critical (implying fussy over-refinement); context decides which.
Easily confused with fastidious
Meticulous means showing great care and precision, usually positively, while fastidious often carries a connotation of being overly or fussily particular.