The phrase "bug in ear" typically refers to a persistent idea or thought that won't go away. Antonyms for this phrase could include clarity, focus, and peacefulness. Clarity would denote the absence of any vague or conflicting thoughts in one's mind, allowing for a clear perception and understanding of one's surroundings. Focus would indicate a sustained attention to a particular task or idea, without any distracting or irrelevant thoughts. Peacefulness would suggest a state of tranquility and calmness, free from any nagging or bothersome thoughts. All these antonyms represent a mental state that is opposite to the feeling of having a "bug in ear", which can be disruptive and unsettling.