Bold as brass is an idiom typically used to describe someone who is unashamedly confident or fearless. However, there are a variety of synonyms that can be used interchangeably. For instance, instead of saying someone is bold as brass, you might say that they are brazen, audacious, or daring. Other synonyms include fearless, intrepid, courageous and unflinching. Each of these synonyms has its own unique nuance, but they all share the common theme of being confident and unapologetic. Whether you use bold as brass or one of its many synonyms, these phrases convey a sense of strength and resilience that is sure to inspire those around you.