LATIN DICTIONARYLexicon Latīnum
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“impotent” in Latin

The English word impotent itself goes back to Latin possum, through impotēns.

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

impotent
impotens: invalidus: infirmus: imbecillus [SYN. in WEAK].
With reference to the procreation of children, spado (whether naturally or from castration; ☞ Ulp., Dig., 50, 16, 28): sine viribus (Juv.): To be impotent, spadonem esse; *vi genitali carere: liberos procreare non posse.
Crippled, etc. Vid: CRIPPLE.

Quick answer

What is the Latin word for impotent?
The usual Latin words for “impotent” are impotēns, invalidus, īnfirmus; also imbēcillus, spadō. 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.