Translation of "Worthless" in Korean

The factory was so old, the owners thought it was worthless.

공장은 지은 지가 너무 오래 돼서 거의 쓸모없다고 생각했나 봐요.

Inflation is so high that this money is now completely worthless.

초인플레이션 때문에 돈에 아무런 가치도 없습니다