LATIN DICTIONARYLexicon Latīnum
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“energetic” in Latin

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

energetic
acer: vehemens: alacer (at a particular time): gravis: gravitatis plenus (full of power in thoughts and expressions, of a speech): fortis: audax (these two of both persons and things). To adopt energetic measures, fortioribus remediis agere (of remedial measures): strenue aliquid administrare (Cic.): an energetic speech, oratio gravitatis plena, or acris, or vehemens: energetic in action, in rebus gerendis acer, vehemens; or acer et industrius (Cic.): very energetic measures or counsels, consilia acerrima (opposed to consilia inertissima).

Quick answer

What is the Latin word for energetic?
The usual Latin words for “energetic” are ācer, vehemēns, alacer; also gravis, fortis, audāx. 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.