1. in a way that causes destruction, severe damage, or financial ruin

Examples

• The company expanded too quickly and ruinously overextended its finances.
• Medical bills can be ruinously expensive without proper insurance.
• The war ruinously damaged the country’s infrastructure.
• She spent ruinously on luxury items she couldn’t afford.
• The drought ruinously affected crop yields across the region.
• His gambling habit proved ruinously addictive to his family’s savings.