From Longman Dictionary of Contemporary Englishmienmien /miːn/ noun [singular] literaryBEHAVE a person’s typical expression or appearance her sorrowful mien
Examples from the Corpus
mien• Parker was a career State Department official, tall, balding, with a cautious, academic mien.• His mien and his manners continually expressed his sense of himself as an important personage.• Endicott grew into a young man with a solemn mien.Origin mien (1500-1600) Probably from demean “to behave” ( → DEMEANOR) (influenced by French mine “appearance”) 