"Undesirable traits" refers to certain qualities, characteristics, or behaviors that are considered negative or unwelcome in a person or thing. It means these traits are not desirable or preferred. Full definition
They are more likely to develop undesirable traits such as inappropriate aggression, fear, and anxiety. (americanshihtzuclub.org)
But the thing is, I have a great deal of undesirable traits that I was hoping never to pass on to another human being. (goodreads.com)
According to the analyses, those who possess desirable traits had stronger connectivity patterns compared to those with undesirable traits. (techtimes.com)