Playing on heartstrings means to manipulate someone's emotions. Its antonyms would be words and actions that distance one from their sensitive and vulnerable side. They would include being objective, dispassionate, unfeeling, and impersonal. When we have to give negative feedback or be straightforward, we can't let our sympathy or fear hold us back. Antonyms for this phrase also include being tough, critical, factual, or practical. Using logic and facts, having a firm demeanor may be better than sugarcoating, which could come across as disingenuous. Not playing on heartstrings means being honest and realistic, to ensure that we communicate effectively.