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“strong” in Latin

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

strong
Powerful, able to resist, robustus (opposed to imbecillus): firmus (opposed to labans, lubricus, vacillans): validus: valens (opposed to invalidus, debilis): stabilis (opposed to mutabilis, mobilis): solidus (opposed to fluidus, fluxus): pollens (possessing internal strength or powers). Very strong, praevalidus; viribus ingens; qui est magnarum virium: to be very strong, praevalere (Liv.); maximis esse viribus (Suet.); in body, eximio esse corporis robore (Curt.); virium robore insignem esse (Plin.); corporis firmitate excellere (Liv.): to grow or become strong, convalescere; viribus crescere, augeri; incrementa virium capere: a strong man, vir robustus, validus, valens magnarum virium: a strong garrison, praesidium firmum (Liv.): to be strong by sea, in cavalry, classe maritimisque rebus valere; multum valere equitatu.
Numerous, numerosus: frequens: magnus. A strong army, exercitus magnus; numero amplus.
Firm, compact (of things without life), robustus: firmus: solidus. A strong door, fores robustae (Hor.), firmae, solidae: strong food, cibi robustiores (Cels.), non faciles ad concoquendum (Cic.), pleniores, valentes (Cic.): strong cloth, pannus firmior, solidior: strong paper, charta firma, solida, densa: a strong wall, murus firmus, robustus, solidus.
Figuratively; e.g., a strong memory, memoria firmior, tenax (Quint.), magna (Cic.): a strong mind, animus robustus, firmus, confirmatus, fortis: (of arguments, proof, etc.) convincing, ad pervincendum idoneus; firmus ad probandum (fit or apt for evidence; e.g., proof, argumentum): gravis (weighty, and thus also convincing, argumentum; ☞ Cic., Rosc., Com., 12, 36): argumentum gravissimum et firmissimum (i. e., the most strong proof).
(Of speech) (Of speech) emphatic, nervous, gravis: vehemens: potens: fortis. A strong word or expression, vocabulum, verbum, grave, vehemens.
Of spirituous liquors, etc: Strong wine, vinum validum (Plin.), forte (Hor., Pall.), plenum (Cels.): strong medicine, medicamentum validum, potens, praesentissimum; also, strenuum (Curt.): the medicine was so strong, tanta vis medicaminis fuit (Curt.).
Vehement, violent, acer: gravis: vehemens: magnus. A strong wind, ventus vehemens (Cic.), magnus (Caes.): a strong smell, odor gravis, acer, potens (Plin.): a strong voice, vox robusta (Plin.), firma (Quint.), plenior, grandior (Cic.): strong consolation, solatium valens (Sen.), magnum (Cic.): to be in a strong fever, graviore, vehementiore febri jactari (after Cic.).

Quick answer

What is the Latin word for strong?
The usual Latin words for “strong” are rōbustus, firmus, validus; also valeō, stabilis, solidus. 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.