LATIN DICTIONARYLexicon Latīnum
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“passionate” in Latin

The English word passionate itself goes back to Latin passiōnātus.

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

passionate
impotens (not master of his passions; also with the passion of which one is not master in the genitive; e.g., irae, laetitiae: also, that in which one is not his own master e.g., laetitia, postulatum): vehemens, ardens (vehement, burning).
Given to bursts of anger, etc., irae impotens: iracundus: ad iram proclivis; in iram praeceps.

Quick answer

What is the Latin word for passionate?
The usual Latin words for “passionate” are impotēns, vehemēns, ārdeō; also īrācundus, īra, laetitia. 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.