LATIN DICTIONARYLexicon Latīnum
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“headlong” in Latin

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

headlong adj.
praeceps (also in the sense of rash, precipitate; e.g., consilium, mens. In this sense, (The words are found in this connection and order.) praeceps et effrenatus [e.g., mens]: praeceps et immaturus [e.g., consilium]). To fall headlong, praecipitem ferri (IMPROP.; Cic.). A man of headlong courses, homo in consiliis praeceps et devius (Cic.): to rush headlong to one’s destruction, in praeceps ruere; ad pestem ante oculos positam proficisci.
headlong adv.
Mostly by adjective, praeceps: raptim (in a hurried manner). To fly away headlong, praecipitem abire or praecipitem se fugae mandare: to fall headlong in the mud, ire praecipitem in lutum (per caput pedesque; Catullus, 17, 9).

Quick answer

What is the Latin word for headlong?
The usual Latin words for “headlong” are praeceps, cōnsilium, mēns; also raptim, Catullus. 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.