Indicates an action or a function that is excessively or unnecessarily active, beyond normal limits. His overactive response to criticism made the situation worse.
Pro Tip 2/3
Medical Context
Often used in medical settings to describe glands or organs functioning at a higher than normal rate. The doctor diagnosed her with an overactive bladder.
Pro Tip 3/3
Metaphorical Use
Used metaphorically to describe thoughts, imagination, or emotions that are intense or uncontrollable. An overactive sense of responsibility is keeping him awake at night.