fastidious.
Excessively particular, demanding, or fussy about details, especially about tidiness and cleanliness.
Meaning & usage
Excessively particular, demanding, or fussy about details, especially about tidiness and cleanliness.
Overly concerned about tidiness and cleanliness.
Difficult to please; quick to find fault.
Having precise requirements for nutrition and environment (chemical and physical); especially, being difficult to culture because of those requirements.
fastidious organism
fastidious species
Where this word comes from
Borrowed from Latin fastīdiōsus (“passive: that feels disgust, disdainful, scornful, fastidious; active: that causes disgust, disgusting, loathsome”), from fastīdium (“a loathing, aversion, disgust, niceness of taste, daintiness, etc.”), perhaps for *fastutidium, from fastus (“disdain, haughtiness, arrogance, disgust”) + taedium (“disgust”). Cf. French fastidieux.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.