The phrase "of one's accord" means to do something willingly and voluntarily, without force or pressure from others. Some antonyms for this phrase include "coerced," "forced," "compelled," "obliged," or "pressured." These words imply that someone is being made to do something against their will or without their consent. Other antonyms for "of one's accord" could include "reluctantly," "hesitantly," or "grudgingly," which also suggest a lack of enthusiasm or willingness to participate. If someone is not acting "of their own accord," it's important to understand why and take steps to address any underlying concerns or issues.