Tā jìngrán bù chéngrèn zìjǐ de cuòwù, zhēn shì wúchǐzhītú!
He actually refuses to admit his mistake — what a shameless person!
Tips
memory
无 (without) + 耻 (shame) + 之 (structural particle) + 徒 (person; follower) — a person who has no shame. 之徒 is a classical pattern meaning a person of this type.
