28 synonyms for in ruins such as decaying, at an end, and broken-down. In ruins is a noun, and its antonyms are intact and flourishing.
At an end, broken-down, decaying, decrepit, derelict, destroyed, dilapidated, done for, falling apart, falling down about one's ears, falling to pieces, finished, gone to rack and ruin, in ashes, in disrepair, in pieces, in shreds, in tatters, neglected, on the rocks, over, ramshackle, ruined, ruinous, toast, tumbledown, and uncared-for.