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“phlegmatic” in Latin

The English word phlegmatic itself goes back to Latin phlegmaticus.

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

phlegmatic
PROP., phlegmaticus (medical technical term).
Figuratively, tardus, segnis, iners (slow): lentus, patiens (void of sensibility).

Quick answer

What is the Latin word for phlegmatic?
The usual Latin words for “phlegmatic” are phlegmaticus, tardus, sēgnis; also iners, lentus, patior. 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.