LATIN DICTIONARYLexicon Latīnum
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“coolness” in Latin

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

coolness
*frigus temperatius or (Hor.) amabile; also frigus only, [Vid. COOL, s.] .
Impudence, Vid:
Bravery, Vid:
Indifference, pectus lentum (Tiberius): lentitudo (indifference with which one looks on any wrong done to others): frigus (want of interest that one displays towards others).

Quick answer

What is the Latin word for coolness?
The usual Latin words for “coolness” are amābilis, lentitūdō, frīgus. 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.