Adverse and Averse are the adjectives which have ‘opposition’ as the central meaning. However the two words are used in different contexts.

* Adverse is mainly used to describe effects and events. Averse is used of persons.

* Adverse usually conveys a strong sense of hostility or harmfulness. Averse expresses the feeling of being opposed or unwillingness to do a thing.

We must learn to fight against adverse circumstances.
We should be ready for adverse criticism after the failure of our major schemes.
He has a strong aversion to violence.
They are not averse to holding another round of discussion.
( Averse is usually followed by to )