The phrase "longing eye" describes a gaze filled with desire, yearning, or profound need. Some synonyms for this expression could include "yearning gaze," "aching stare," "intense longing look," or "wistful glance." Other alternatives could be "craving stare," "hopeful gaze," "ardent longing eye," or "aching longing stare." The meaning behind each synonym is similar to the original phrase, and each term conveys a deep sense of longing or desire. Whatever the exact phrase used, the sentiment behind it is sure to evoke powerful emotions and a strong sense of longing.