Effects of prolonged Opioid addiction-
Persistent use creates a dysregulation of dopamine transmission, and impairment of cognition and function in the frontal brain regions. Even several years into recovery, people who abused opioids continue to experience impairment and dysfunction.

incompetent -
Dictionary
Definitions from Oxford Languages · Learn more
adjective
- not having or showing the necessary skills to do something successfully.
"a forgetful and utterly incompetent assistant"