The term "infiltrate" is defined as secretly entering and taking control of an organization or group without being noticed. Its antonyms refer to behavior or actions that are the exact opposite of infiltration. The opposite of infiltrate includes actions such as retreat, evacuate, retreat, withdraw, and extricate. These antonyms refer to a person or group moving away from a situation rather than entering it. Other antonyms for infiltrate include expel, exclude, refuse, reject, and resist, all of which indicate an opposing behavior to the act of infiltration. The use of antonyms helps to clarify different meanings and context for the word infiltrate.