Everybody is unique. If someone is describing to you a person that you've never met then they will need to use descriptive adjectives to make you understand what the person being described is like.
Human nature usually leads us to want to describe people in a positive manner at first so adjectives such as fun, reliable, confident and courageous will be used. If you want to highlight a person's bad qualities then you are more likely to describe said person using adjectives such as aggressive, arrogant or disrespectful.
Because people are so complex and unique, you may have to use several descriptive adjectives to accurately outline a person.