[ 'advə:s ]
■ adjective preventing success or development; unfavourable.
Derivatives
~ly adverb
Origin
ME: from OFr. advers , from L. adversus 'against, opposite', from advertere , from ad- 'to' + vertere 'to turn'.
Usage
A common error is to use ~ instead of averse , as in I am not ~ to helping out , rather than the correct form I am not averse to helping out.