LATIN DICTIONARYLexicon Latīnum
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“unintentionally” in Latin

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

unintentionally
imprudenter: per imprudentiam: inconsulte: temere. (The words are found in this connection and order.) inconsulte ac temere: temere ac fortuito: casu (by accident). Often by the adjectives, insciens, imprudens (e.g., feci aliquid).

Quick answer

What is the Latin word for unintentionally?
The usual Latin words for “unintentionally” are imprūdēns, incōnsultus, temere; also cadō, īnsciēns. 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.