LATIN DICTIONARYLexicon Latīnum
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“speculative” in Latin

The English word speculative itself goes back to Latin specula, through speculativus.

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

speculative
(philosophia) quae contemplatione rerum continetur; or simply (philosophia) contemplativa (Sen., Ep., 91, 10). A speculative genius, ingenium sollers, acutum; or, from the context, sollertia (Cic.).

Quick answer

What is the Latin word for speculative?
The usual Latin words for “speculative” are acuō, philosophia, contemplātīvus; also sollers. 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.