The phrase "bought in to" refers to a person accepting or agreeing with a particular idea or proposition. The antonyms for "bought in to" are "reject" or "disagree." When you reject something, you express a refusal to accept or consider it. Disagreeing, on the other hand, implies an opposition in opinion or belief. Other antonyms for "bought in to" include "disbelieve," "oppose," "refuse," "dissent," and "disavow." These words convey disagreement or non-acceptance of a particular idea, concept, or belief. Using the appropriate antonyms for "bought in to" can help to communicate one's disagreement or lack of acceptance of a particular idea.