Noun
trauma - A deeply distressing or disturbing experience, especially one with lasting emotional impact; a psychological or emotional wound, often resulting from an intense or life-threatening event.
Childhood trauma can have long-lasting effects on a person’s mental health
dunce - A derogatory term used to ridicule someone who is not very clever, or who does not learn easily.
Being called the dunce of the class motivated Joe to work harder and he finished top of the class. Now sometimes he puts on a joker's costume to make fun of those who used to make fun of him.