All 4 Uses

demeanor
in
The Gold-Bug
(Auto-generated)

He now grew more composed in his demeanor; but his original air of enthusiasm had quite disappeared.†
*
His demeanor was dogged in the extreme, and "dat deuced bug" were the sole words which escaped his lips during the journey.†
Perhaps there was something, amid all the extravagant demeanor of Legrand—some air of forethought, or of deliberation, which impressed me.†
In this expedition to the 'Bishop's Hotel' I had been attended by Jupiter, who had, no doubt, observed, for some weeks past, the abstraction of my demeanor, and took especial care not to leave me alone.†

Definitions:

(1) (demeanor)
the manner in which a person behaves
(2) (meaning too rare to warrant focus)
Much more rarely, the verb form may be used as a synonym for behave as in: "Try to demean yourself with dignity."