Opposed means set against something. Strongly opposed, opposed to the plan, as opposed to.
The construction is opposed to, always with the preposition. As opposed to is a common phrase meaning rather than, used to draw a contrast: paid weekly as opposed to monthly. Diametrically opposed means as far apart as two positions can be.
1adjectiveopposedSet against something.
“Most local residents are opposed to the plan for a new airport.”
opposed is a stance.