"Are all ears" is an idiom that means someone is fully attentive and listening carefully to what someone else is saying. However, there are several antonyms for this expression that describe the opposite behavior. For instance, "tuned out" means someone is not paying attention and may be distracted by something else. "Closed ears" implies that someone is intentionally ignoring what is being said. "Indifferent" suggests that someone doesn't care about what is being discussed and is uninterested in the conversation. Finally, "disinterested" means that someone is impartial or unbiased and has no stake in the conversation. These antonyms highlight the importance of being an active listener and engaging with others during a conversation.