Bolloxes are a British slang term for testicles, often used as a vulgar insult or in expressions of disbelief. Due to its offensiveness, it's not uncommon for people to look for other words or phrases they can use instead. Some possible synonyms for bollox might include balls, nuts, gonads, or family jewels. Of course, some of these options may still be considered vulgar or offensive, so it's important to choose your words carefully depending on the situation and your audience. If you're looking for a less vulgar alternative, you might try using words like nonsense, rubbish, hogwash, or baloney instead. These words still convey the idea of something being untrue or ridiculous, but without resorting to crude language.