The word "ruinous" means in a state of complete disrepair or decay, to such an extent that something is no longer usable or functional. It can refer to a physical structure that has fallen into ruins due to neglect, age, or natural disasters, as well as other things like relationships, reputations, and businesses that have been destroyed or severely damaged. The term implies a sense of abandonment, loss, and hopelessness, suggesting that whatever was once there is now beyond repair and beyond salvation.