What is the Latin word for decrepit?

The usual Latin words for “decrepit” are dēcrepitus, ēnervō, Phaedrus. The right choice depends on the sense; see the distinctions below.

English → Latin

“decrepit” in Latin

dēcrepitusOf old men or old animals, very old ēnervōto remove the nerves and sinews; to enervate, weaken; to make effeminate PhaedrusPhaedrus (an Athenian aristocrat, friend of Socrates); Phaedrus (a Latin fabulist)

The English word decrepit itself goes back to Latin crepō, through dēcrepitus.

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

decrepit

decrepitus; aetate decrepita (Cic.): confectus senectute (enfeebled by age): enervatus: annis defectus (Phaedrus).

Quick answer

What is the Latin word for decrepit?: The usual Latin words for “decrepit” are dēcrepitus, ēnervō, Phaedrus. 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.