How to use demeanor in a sentence?

Her calm demeanor helped diffuse the tense situation.

1. His calm demeanor belied the urgency of his mission.
2. The witness's unwavering demeanor convinced the jury of her credibility.
3. Despite the chaos, the leader maintained a dignified demeanor.
4. Her friendly demeanor put her clients at ease.
5. The suspect's shifty demeanor aroused suspicion.
6. The judge's stern demeanor discouraged any outbursts in the courtroom.
7. The child's innocent demeanor melted away as the truth was revealed.
8. He had an arrogant demeanor that grated on everyone's nerves.
9. The professor's aloof demeanor made it difficult to approach her.
10. Despite their differences, the colleagues maintained a professional demeanor.