The word 'overact' is often used in theater and film to describe performances that are excessively dramatic. He tends to overact during auditions, which can turn the directors off.
Pro Tip 2/3
Negative Connotation
'Overact' usually implies a negative judgment, suggesting the performance is less believable. The audience laughed because she overacted her grief in the scene.
Pro Tip 3/3
Emotional Expression
Use 'overact' when someone expresses an emotion too strongly, making it feel artificial. During the debate, he overacted his anger and lost credibility.