I have gone my who life without knowing about Oppositional Defiant disorder (ODD). It is a behavioral disorder, commonly found in children and adolescents. It is seen as a pattern of hostile and disobedient behavior. Normally this behavior is directed at adults and figures of authority (like teachers). Sufferers argue with adults and have a hard time controlling their behavior. The most common behaviors are negativity, hostility, defiance and aggression.
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