adverse


Concise Oxford English Dictionary © 2008 Oxford University Press:
adverse /ˈadvəːs/
adjective preventing success or development; unfavourable.
– derivatives
adversely 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 adverse instead of averse, as in I am not adverse to helping out, rather than the correct form I am not averse to helping out.
'adverse' also found in these Oxford entries:

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