LATIN DICTIONARYLexicon Latīnum
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“why” in Latin

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

why
cur? quamobrem? (in asking for the end): quare? (in asking for the cause or occasion): quapropter? qua de causā? quid est cur? quid est quapropter? quid est causae cur? quid est quod? (in asking for the motive): quid (denotes in general that to which the verb refers; e.g., quid rides? why do you laugh? i. e., at what do you laugh? what is the object of your laughter?): why not? cur non, with an indicative (asking the reason why a thing is not done): quidni, with a subjunctive (asking, with astonishment, how it is that another does not perceive the reason of a thing): quin, with an indicative (refers to an urgent necessity of doing something; e.g., cur non domum uxorem arcessis? quidni possim? quin quod ferendum est fers?). There is no reason (what reason is there, etc.) why I should not do this, nulla est causa (quid causae est? etc.), quin hoc faciam: why can’t they? etc., quid est causae, quin... possint (e.g., coloniam deducere)?

Quick answer

What is the Latin word for why?
The usual Latin words for “why” are quamobrem, quārē, quāpropter; also quid nī. 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.