1. Any external or internal factor that triggers a stress response in an organism, causing physical or psychological strain
The upcoming exam was a stressful stimulus that kept the student awake at night.
O exame próximo foi um estímulo estressante que manteve o estudante acordado à noite.
2. In psychology and neuroscience, an environmental event or condition that elicits a stress reaction
Loud noises can be a stressful stimulus for people with sensory sensitivities.
Barulhos altos podem ser um estímulo estressante para pessoas com sensibilidades sensoriais.