YOU SAID:

The weather is quite dreadful

INTO JAPANESE

天気はかなり恐ろしい

BACK INTO ENGLISH

The weather is pretty horrible.

INTO JAPANESE

天気はかなり恐ろしいです。

BACK INTO ENGLISH

The weather is pretty scary.

INTO JAPANESE

天気はかなり怖いです。

BACK INTO ENGLISH

The weather is pretty scary.