LATIN DICTIONARYLexicon Latīnum
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“calmness” in Latin

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

calmness
of the sea [Vid. CALM, s.].
Of the mind, tranquillitas animi, tranquillitas, animus tranquillus; aequus animus, aequitas animi: from context asquitas only. To bear anything with calmness, placide or sedate ferre aliquid: not to bear anything with calmness, aliquid aegre ferre.

Quick answer

What is the Latin word for calmness?
The usual Latin words for “calmness” are tranquillitās, placidus. 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.