Definitions

1. noun

A person who is opposed or antagonistic to another person or thing.

“The company’s main adversant was a rival firm trying to undermine its market share.”

2. noun

A person or thing that is in opposition to something else.

“The treatment’s primary adversant was the patient’s underlying health condition.”

3. verb

To oppose or resist something.

“The new policy will be adversantly received by many stakeholders.”