LATIN DICTIONARYLexicon Latīnum
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“fastidious” in Latin

The English word fastidious itself goes back to Latin taedium, through fastīdiōsus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

fastidious
fastidiosus (of persons; also of things, aurium sensus fastidiosissimus, Auct., Her.): morosus: difficilis et morosus (not easy to be pleased, etc.): delicatus (that is easily offended by anything repulsive, etc., e.g., aures; Quint.). Too fastidious in his choice of words, in cura verborum nimius.

Quick answer

What is the Latin word for fastidious?
The usual Latin words for “fastidious” are fastīdiōsus, mōrōsus, dēlicātus; also auris. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.