Definition of defy :
1. A challenge.
2. To provoke to combat or strife; to call out to combat; to challenge; to dare; to brave; to set at defiance; to treat with contempt; as, to defy an enemy; to defy the power of a magistrate; to defy the arguments of an opponent; to defy public opinion.
3. To renounce or dissolve all bonds of affiance, faith, or obligation with; to reject, refuse, or renounce.
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counteract (part of speech: verb)
defy (part of speech: verb)
confront (part of speech: verb)
disagree (part of speech: verb)
resist (part of speech: verb)
oppose (part of speech: verb)