adjective
ruinous
ROO-ih-nus/ˈruːɪnəs/
Causing severe damage or loss.
The ruinous flood destroys the shop's merchandise and damages its structure.

Etymology
Built on ruina, “collapse,” ruinous first described something falling into ruin. Its meaning shifted from suffering destruction to causing it, including bringing severe financial loss.
In context
wicked and ruinous as it must be. A destroyer of my tenderest hopes, my dearest schemes
More examples
- A prolonged drought can have ruinous effects on small farms.
- The lawsuit proved ruinous to her business.
- He borrows money at a ruinous interest rate.
Forms
ruinous
ruin verb — To damage severely or destroy completely.
ruinously adverb — In a way that causes severe loss.
Similar words
- devastating
- Emphasizes overwhelming harm, often including deep emotional suffering.
- destructive
- Emphasizes damaging or destroying things, not necessarily financial loss.