LATIN DICTIONARYLexicon Latīnum
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“thoughtlessness” in Latin

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

thoughtlessness
inconsiderantia, temeritas (want of due reflection): securitas (freedom from care and from fear of danger): imprudentia (want of foresight): socordia (want of thought, observation, etc.): incuria (want of activity and good heed; indifference): negligentia (negligence and indifference).

Quick answer

What is the Latin word for thoughtlessness?
The usual Latin words for “thoughtlessness” are incōnsīderantia, temeritās, sēcūritās; also imprūdēns, socors, incūria. 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.