/ əˈvɜːs; NAmE əˈvɜːrs/ adjective [ not before noun ]
1.
not ~ to sth / to doing sth liking sth or wanting to do sth; not opposed to doing sth :
I mentioned it to Kate and she wasn't averse to the idea.
2.
averse to sth / to doing sth ( formal ) not liking sth or wanting to do sth; opposed to doing sth :
He was averse to any change.
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WORD ORIGIN
late 16th cent.: from Latin aversus turned away from, past participle of avertere , from ab- from + vertere to turn.