The phrase "wanton away" can have different meanings depending on the context it is used in. However, some possible synonyms for this phrase could include "squander," "waste," "fritter," or "lavish." These words all convey a sense of indulging in something without concern for the consequences or without a clear purpose in mind. Additionally, "fritter" and "lavish" both suggest a sense of excess or extravagance. Depending on the context, other possible synonyms could include phrases like "fritter away," "waste without thought," or "squander recklessly." Ultimately, the specific synonym chosen will depend on the nuances of the sentence or phrase in which "wanton away" appears.