Cojones is a slang term used to describe a person's boldness, courage, or nerve. Synonyms for cojones include balls, guts, bravery, audacity, nerve, and fearlessness. Colloquially, you could also use terms like moxie, spunk, grit, or backbone. Additionally, swear words like "fuck" or "damn" could be used to convey the same level of intensity and boldness. However, it's important to remember that these terms can be considered vulgar and offensive depending on the situation and audience, so it's best to use them with caution. Ultimately, there are many different ways to convey boldness and courage in language without relying on crude slang phrases.