Mild:
* Sensitive: This implies that the person is easily affected by things others might not notice.
* Emotional: This suggests that the person experiences emotions strongly and readily.
* High-strung: This describes someone who is easily agitated or nervous.
Moderate:
* Overreactive: This is a direct description of the behavior.
* Dramatic: This suggests that the person makes a big deal out of things.
* Exaggerated: This implies that the person's reaction is not proportionate to the situation.
* Hysterical: This suggests a more extreme and uncontrolled reaction.
Strong:
* Neurotic: This implies that the person has a tendency to overreact due to underlying anxiety or insecurity.
* Paranoid: This suggests that the person sees threats and danger where none exist.
* Obsessive: This describes someone who fixates on minor issues and worries excessively.
The best word to use depends on the specific situation and the degree of overreaction. It's important to be mindful of the connotations of each word and choose one that accurately reflects the person's behavior.