The phrase "was all ears" means to listen attentively or with great interest. Antonyms for this phrase could include "disinterested," "distracted," "unfocused," "oblivious," or "unconcerned." These words suggest a lack of attention or interest in what is being said, and imply a lack of engagement with the conversation. In contrast, being all ears implies a high level of interest and active participation in the conversation, allowing for effective communication and understanding. When someone is all ears, they are fully present and engaged, rather than distracted or disinterested.