Translation of "Omen" in Japanese

You're my good omen.

お守りはあなたよ。

I always thought that suffering a heart attack was an omen of death.

私はいつも思っていた、心筋梗塞を患うことは死期を知らせる前兆だと。

- His laziness boded ill for the future.
- His laziness was a bad omen for the future.

彼の怠惰は将来に対する悪い前兆だった。