LATIN DICTIONARYLexicon Latīnum
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“extravagant” in Latin

The English word extravagant itself goes back to Latin vagor, through extravagans.

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

extravagant
Wandering beyond fixed limits, etc., longius progrediens, evagans (in a speech): intemperans: effrenatus (in indulgence of lusts, etc.).
Immoderately expensive, luxuriosus: ad luxuriam effusus: luxuria diffluens (of very expensive, luxurious habits): largus (spending largely): prodigus (Cic. makes prodigi the faulty, liberates the good species of largi). To be very extravagant, extra modum sumtu et magniricentia, prodire.
Excessive, immodestus (exceeding all bounds; of men or things; e.g. fautor histrionum; largitio): immoderatus (not restrained; of things; e.g., cupiditas, luxuria): effusus (pouring itself out beyond its ordinary limits; e.g., laetitia: hilaritas, sumtus; also of persons; e.g., effusior in largitione): profusus (with nearly the same meaning; laetitia, hilaritas, sumtus: epulae, convivia): nimius (too muck; too great): impotens (powerless, from passion, to restrain itself; laetitia, cupiditas; postulatum): insanus (senseless; cupiditas): nimis exquisitus (too recherche; e.g., munditia, Cic.).

Quick answer

What is the Latin word for extravagant?
The usual Latin words for “extravagant” are ēvagor, intemperāns, effrēnō; also lū̆xuriōsus, largus, prōdigus. 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.