LATIN DICTIONARYLexicon Latīnum
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“crazy” in Latin

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

crazy
Weak, imbecillus (imbecillis is a later form; deficient in proper strength, as well with reference to the body as the mind; opposed to fortis, valens, firmus): fragilis (not durable): caducus (that is inclined to fall or to give way). [Vid: also, WEAK.] A crazy head, ingenium imbecillum: homo imbecillus: anything that is crazy; e.g., a house, ruinosus: pronus in ruinam; vitiosus (damaged); delabens (tumbling to pieces): to be crazy, ruinosum esse: ruinam minari; labare (tottering): a crazy house, aedes ruinosae.
With reference to the mind: ingenii imbecillis (mentally weak): mente captus: mente alienatus: demens: amens: vesanus: insanus: vecors: delirus. [SYN. in MAD]: to be crazy, mente captum; mente alienatum esse; insanire; delirare: to become crazy, mente alienari; in insaniam incidere: to turn or make anybody crazy, ad insaniam adigere aliquem.

Quick answer

What is the Latin word for crazy?
The usual Latin words for “crazy” are imbēcillus, fragilis, cadūcus; also dēmō, āmēns, vēsānus. 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.