The word "in-grain" means to firmly establish something, such as a habit or a belief, so it becomes an intrinsic part of one's personality or character. The antonyms for this word are "uproot" or "eradicate," which means to remove or destroy something completely. Other antonyms for "in-grain" include "unsettle," "dislodge," "disorder," or "unsettle," in which one's beliefs or habits are challenged or disrupted. To "unlearn" or "uncondition" oneself is another antonym for the word " in-grain." By doing so, one can break free from established patterns or habits, and open oneself to new ideas and opportunities.