Adverse / Averse
Different meaningsAdverse describes an unfavourable thing or effect; averse describes someone's attitude and is usually followed by to.
Adverse
Use when
You mean harmful, unfavourable or contrary to an interest.
Example
“The change had no adverse effect on service availability.”
Averse
Use when
A person is opposed or strongly disinclined to something.
Example
“The steering group is not averse to extending the pilot.”
Quick check
adverse to the proposal, averse effect, risk adverse
Usage note