The phrase "bug in one's ear" often refers to a persistent or nagging idea or thought that won't go away. Some antonyms for this phrase could be "peace of mind," "quietude," or "tranquility." These words suggest a state of calm and mental clarity, free from distractions or intrusive thoughts. Other antonyms for "bug in one's ear" could include "indifference," "apathy," or "unconcern." These words suggest a lack of interest or investment in a particular matter or issue. While "bug in one's ear" can have negative connotations, its antonyms suggest positive, peaceful, and contented states of mind.