Guānyú nà cì shībài, tā zhīzìbùtí, hǎoxiàng shénme dōu méi fāshēng guò.
About that failure, he said absolutely nothing, as if nothing had ever happened.
Tips
usage
只字不提 emphasizes complete silence on a topic — not even a single character (字) is spoken. It often implies deliberate avoidance or a conscious decision to stay quiet about something uncomfortable.