Which of the following is NOT one of the characteristics that define a professional?

A professional is typically characterized by specific attributes that enhance their credibility and effectiveness in their field. One of the key characteristics is a body of knowledge, which refers to the specialized information and understanding that a professional possesses in their area of practice. This knowledge is often built through education, training, and experience.

Additionally, a professional attitude is crucial. This encompasses a commitment to ethical standards, accountability, and respect for others, which are essential in establishing trust and reliability. Furthermore, professionals possess specific skills that are honed through practice and enable them to perform their duties with competence and confidence.

In contrast, a casual demeanor does not align with the traits that define a professional. A casual demeanor may imply a lack of seriousness or commitment, which undermines the professional image. Therefore, this choice stands out as it does not encapsulate the essence of professionalism, while the other characteristics do embody it.