LATIN DICTIONARYLexicon Latīnum
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“deteriorate” in Latin

The English word deteriorate itself goes back to Latin dēterior, through dēteriorātus.

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

deteriorate
INTR., deteriorem fieri: in pejorem partem verti et mutari: in pejus mutari. To have deteriorated, deteriore statu or conditione esse; pejore loco esse.
TRANS., deterius facere or in detenus mutare aliquid (opposed to corrigere): in pejus mutare or vertere et mutare (opposed to in melius mutare): corrumpere: depravare (either physically or morally; opposed to corrigere): cf., Deteriorare, very late; Claud. Mamert., Frontin., Symm.

Quick answer

What is the Latin word for deteriorate?
The usual Latin words for “deteriorate” are corrumpō, dēprāvō. 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.