What are the hallmarks of verbal abuse?

well what kind of abuse?

for instance verbal abuse could be recognized by someone distancing themselves or becoming depressed, or even violent.

physical abuse, could be recognized by bruising, scarring, or even long clothing, which could indicate that the person does not want their marks to be seen.

substance abuse is commonly recognized with, hyperactive behavior, or short attention spans, or even look for symptoms of withdrawl in case they go without.

hope i helped!