と言ってよいか分からなかった

didn't know what to say

→ と

phrase Rare #30,626

didn't know what to say Often follows 何, meaning “what”: 何と言ってよいか分からなかった means “I didn't know what to say.”

JA: 何と言ってよいか分からなかったので、黙っていた。

EN: I didn't know what to say, so I stayed silent.