A thorough professional is someone who takes their work seriously and pays great attention to detail. They are highly skilled in their field and take pride in doing things right. They are committed to their job and always strive for excellence. They are reliable, responsible and take their responsibilities seriously. They are also constantly updating their knowledge and skills to stay current in their field. In short, a thorough professional is someone who takes their work seriously and does it with great care, attention to detail, and dedication.