There are several synonyms for the phrase "use profanity." Some milder alternatives include "swear," "curse," or "use foul language." More aggressive synonyms could include "cuss," "blaspheme," or "utter obscenities." Depending on the context and audience, choosing the right synonym can make a big difference in the way one is perceived. Using profanity can often come off as unprofessional or immature, so finding a more appropriate way to express oneself is important. Instead of relying on profanity, one could try using stronger adjectives or precise language to convey their emotions or frustrations.