When it comes to synonyms for "act precipitately," there are quite a few alternatives to choose from. For instance, one could use the phrase "act hastily" to convey the sense of urgency that often accompanies such behavior. Similarly, "act recklessly" could be used to describe a situation where someone is acting in an impulsive or thoughtless manner. Other options might include "act impulsively," "act rashly," or "act without thinking." Ultimately, the choice of synonym will depend on the context and the tone of the message the writer is trying to convey. Regardless of which word or phrase is ultimately chosen, it should help to capture the sense of urgency and impulsivity that comes with acting precipitately.