怖くなった

became scared, got scared

→ 怖い
怖く scary + なっ become, get + た Past tense
adjective · past tense Rare #39,971
became scared, got scared Expresses becoming afraid; 怖い means “scary” or “afraid,” depending on context.
JA: 急に怖くなった。
EN: I suddenly got scared.
Forms of 怖い

怖くなったか?

Did you get scared?

— Good Luck, Have Fun, Don't Die (2026)

私は怖くなった壊したと思ったからです

I got scared because I thought I had broken it.

— 人生スイッチ (2014)

容疑者になると思って怖くなった

I got scared because I thought I was going to become a suspect.

— 落下の解剖学 (2023)

怖くなったんだ

I got scared.

— セントラル・ステーション (1998)