Not in favor of (an action or proposal etc.).

1. Of the same kind but situated opposite, exerting energy in the opposite direction, or pursuing an opposite policy; one that is opposite in kind to
2. Opposing or hostile to in opinion, sympathy, or practice; opposing in effect or activity
3. Serving to prevent, cure, or alleviate
4. Combating or defending against

One that is opposed.

Opposed to; against