ruinous

adjective
1
costing a lot of money and more than you can afford
بسیار گران, هزینه‌بر, اسراف‌آمیز
2
causing serious problems or damage
ویرانگر, ویران‌کننده, مخرب, زیان‌آور, زیان‌بار, خراب‌کننده, آسیب‌رسان
The decision was to prove ruinous.
Such action would be ruinous to her career.
a ruinous mistake
synonym devastating
3
destroyed or severely damaged
ویرانگر, مخرب, نابودکننده
The buildings were in a ruinous state.
This part of the church is ruinous.