Definitions

1. adjective

causing or tending to cause ruin or destruction

“The ruinous state of the abandoned factory posed a serious health risk to the neighborhood.”

2. noun

a ruinous place or situation

“The tourist visited the ancient, ruined city, now a vast ruinous landscape.”

3. verb

to cause or bring about ruin or destruction

“The financial crisis ruined many investors, leaving them financially ruined.”