1. outward behavior or bearing; the way a person conducts themselves
Usage: British spelling; American spelling is ‘demeanor’

Examples

• Her calm demeanour helped reassure the nervous students.
• The witness maintained a serious demeanour throughout the trial.
• His friendly demeanour made him popular with customers.
• The teacher’s stern demeanour commanded respect in the classroom.
• Despite the pressure, she kept a professional demeanour during the meeting.
• The child’s shy demeanour made it difficult for him to make friends.