Nàxiē guānyú tā de chuánwén dōu shì wújī de, dàjiā búyào xiāngxìn.
The rumours about him are all baseless; don't believe them.
Tips
usage
稽 means to check or verify, so 无稽 is "impossible to verify". It is most common in 无稽之谈 (sheer nonsense) and 荒诞无稽 (absurd). Here 稽 is read jī, not qǐ as in 稽首 (to kowtow).