The phrase "wast promiscuous" conveys a sense of carelessness or irresponsibility in one's actions. There are several synonyms that capture this meaning, including "reckless," "thoughtless," "heedless," and "unmindful." Other options might include "irresolute," "imprudent," or "inconsiderate." The broader concept of waste or squandering might also be captured by terms such as "prodigal," "spendthrift," or "extravagant." With a bit of nuance, the phrase might also be replaced with less negative terms such as "free-spirited," "impulsive," or "adventurous," depending on the context and tone of the text. Regardless of the specific synonym chosen, each conveys a slight variation of the same underlying concept - a lack of discipline or restraint in one's behavior.