The phrase "aching for" implies a strong desire or longing for something. The antonyms for this phrase would be words that convey a lack of interest or indifference towards something. These could include words like content, satisfied, fulfilled, indifferent, or disinterested. A person who is content with their current circumstances may not be "aching for" anything else. Similarly, someone who is indifferent or disinterested may not have any strong desires or longings. By using antonyms for "aching for," we can convey a different mood or tone in our writing or speech, highlighting a lack of intensity or passion.