All 3 Uses

demeanor
in
The Ultimate Gift
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If at any time during the next twelve months you do not perform as called for, or if Mr. Hamilton does not approve of your attitude and demeanor, he will simply stop the process and cut you off from my ultimate gift to you.†
Chpt 3 *
As we sat at the conference table to begin our ninth month of this journey together, I noticed an amazing change in Jason's countenance, attitude, and demeanor.†
Chpt 11
At the end of the month, Jason Stevens entered my office with the demeanor and carriage of a man on a mission.†
Chpt 13

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."