1. Excessively or abnormally reactive; responding with greater intensity or sensitivity than is typical or expected.
Usage: Often used in medical, psychological, or scientific contexts.; Can describe immune systems, emotional responses, or chemical reactions.

Examples

• The patient's hyperreactive immune system caused severe allergic responses to common substances.
• Children with ADHD sometimes display hyperreactive behavior to environmental stimuli.
• The hyperreactive airway made the athlete prone to exercise-induced asthma.
• Her hyperreactive emotional state meant she became upset easily at minor frustrations.
• The hyperreactive chemical compound required careful handling in the laboratory.
• Stress can make the nervous system hyperreactive, leading to anxiety symptoms.