Pining away is a phrase that commonly refers to a sense of longing or yearning, often for something or someone that is unattainable. However, there are a multitude of synonyms that can be used in place of this phrase to convey the same emotion. These include "aching," "yearning," "longing," "craving," "desiring," "hankering," and "wishing," among others. Each of these synonyms adds depth and nuance to the emotion of pining away, and can be used in a variety of contexts to add flavor and personality to any piece of writing or conversation.