His foot is exhibiting inversion.

He is receiving treatment for inversion of the foot.

He is portrayed as an antihero character.

He was surprised by the recoil of the gun.

It is said that antimatter has properties opposite to those of matter.

He was expelled from the party because he took anti-party actions.

He invented an anti-gravity device.

He opposed the plan.

His speech was a double negative, making it difficult to understand.

He likes to take a walk in the park at dusk.