LATIN DICTIONARYLexicon Latīnum
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“expensive” in Latin

The English word expensive itself goes back to Latin pendō, through *expēnsīvus.

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

expensive
sumtuosus (causing great outlay; a wife, games, parties): pretiosus: magni pretii: multorum nummorum (that has cost much; furniture, estates, a library, wares, etc.): lautus (recherche, of furniture, parties, etc.): carus (dear). Sometimes magnificus: splendidus. My establishment is a very expensive one, magni mihi sumtus domi quotidiani fiunt (Ter., Heaut., 4, 5, 6).
Given to lavish expenditure, prodigus: profusus; in anything, prodigus or effusus in aliqua re.

Quick answer

What is the Latin word for expensive?
The usual Latin words for “expensive” are pretiōsus, lavō, cārus; also prōdigus, profundō, partiō. 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.