His demeanor, in fact, strangely mimics that of his aircraft: robotic.
In her demeanor, Rebekah Brooks would seem to be a new phenomenon—a person unable to conceal the depths of her self-satisfaction.
Commenting on his vanilla—some might even say “hokey”—demeanor, my wife said he reminded her of the father on Leave It to Beaver.
late 15c., from obsolete Middle English demean "handle, manage, conduct," later "behave in a certain way" (early 14c.), from Old French demener (11c.) "to guide, conduct; to live, dwell," from de- "completely" (see de-) + mener "to lead, direct," from Latin minare "to threaten," in Late Latin "to drive (a herd of animals);" see menace. Sense in English evolved from notion of "conduct, manage" (oneself). Spelling changed by influence of nouns in -or, -our.