Merriam-Webster's Word of the Day for November 8, 2023 is:

mien • \MEEN\  • noun

Mien is a literary word that refers to a person's demeanor or appearance, especially as expressive of their attitude or personality.

// The minister projected a stern and serious mien from the pulpit, but we found him to be friendly and welcoming when we spoke with him in the social hall after the service.

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Examples:

"'Hit Man,' a new movie from Richard Linklater, was co-written by its leading man, Glen Powell, and proved to be the perfect showcase for his charisma. Playing a philosophy professor turned fake assassin, Powell changes his costume, accent, and mien with joyful abandon, pulling the audience along as the stakes and absurdities continue to mount." — Alex Barasch, The New Yorker, 22 Sept. 2023

Did you know?

Mien is a somewhat literary term that refers to a person’s appearance and behavior toward others—that is, their outward manner or demeanor. Mien and demeanor are also linked through etymology: mien arose in the early 1500s through the shortening and alteration of the rare verb demean, meaning "to conduct or behave (oneself) usually in a proper manner." The source of demean is a Middle English word meaning (among other things) "to behave in a certain way; to conduct oneself"; that word’s Anglo-French source, demener, could mean (also among other things) "to lead," "to strive," "to guide," and "to behave." Note that the "behave" demean related to demeanor and mien is not related to the more common demean that means "to debase"; that word has its roots in an Old English word meaning "common, shared."