Antonyms for the term "healing agents" essentially refers to substances or agents that cause harm, damage or pose a risk to an individual's physical, emotional or mental well-being. The term 'toxicants,' for instance, can be used as an antonym for healing agents, which refers to harmful chemical agents that can cause poisoning or severe illness. Similarly, the terms irritants, pathogens, and antagonists can also be considered as antonyms to healing agents. An irritant is a substance that causes physical discomfort, while a pathogen refers to an infectious agent that causes disease. An antagonist, on the other hand, is a substance that opposes the action of healing agents to cause harm or block the healing process.