Translation of "Taciturn" in Japanese

The English are a taciturn people.

英国民は無口な国民だ。

Jason was a taciturn individual, so it was always a real surprise when he said anything.

ジェイソンは無口な人だったので彼が何かを言うたび驚いていた。

- He is a man of few words.
- He doesn't talk much.
- He's quiet.
- He is taciturn.
- He is reserved.
- He is quiet.

彼は口が重い。