怖くなかった

wasn't scary, wasn't afraid

→ 怖い
怖く scary + なかっ Past negative + た Past tense
adjective · past tense Rare #44,242
wasn't scary, wasn't afraid The meaning depends on what is being described: something can be not scary, or someone can be not afraid.
JA: その映画は怖くなかった。
EN: That movie wasn't scary.
Forms of 怖い

あまり怖くなかった。

It wasn't very scary.

君地震怖くなかった?

Weren’t you scared of the earthquake?

— すずめの戸締まり (2022)

全然怖くなかったよ。

It wasn’t scary at all.

何も怖くなかった。

I wasn't afraid of anything.