LATIN DICTIONARYLexicon Latīnum
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“prosperous” in Latin

The English word prosperous itself goes back to Latin prō, through prosperō.

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

prosperous
Thriving, prosper or prosperus; fortunatus [Vid: FORTUNATE].
Favorable, secundus: faustus: prosper.

Quick answer

What is the Latin word for prosperous?
The usual Latin words for “prosperous” are prosperus, fortūnō, secundus; also faustus, prosper. 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.