"Wert all ears" is an idiom meaning to be completely attentive and receptive to what someone is saying. While there are no direct antonyms for this phrase, words such as oblivious, apathetic, and inattentive could be considered opposites. These words describe someone who is not paying attention, uninterested, or unaware of what is being said. Other antonyms could include distracted, indifferent, or unmindful. However, it is important to note that these words do not have the same connotation as "wert all ears", which implies active engagement and willingness to listen.