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The flood ruined the entire village.
The flood completely destroyed the entire village.
to be completely destroyed or damaged beyond repair
The fire ruined all their belongings.
The fire destroyed all their belongings beyond repair.
His reputation was ruined by the scandal.
His reputation was completely damaged by the scandal.
Often used to describe physical destruction or severe damage to reputation, plans, or relationships.
Be aware that 'be ruined' can describe physical destruction or severe damage to abstract things like reputations or plans.
Always consider whether 'ruined' is being used literally (physical destruction) or figuratively (damage to reputation, plans, etc.).
From Middle English 'ruinen', from Old French 'ruiner', from Latin 'ruinare' meaning 'to collapse, fall down'.
Can be used literally (physical destruction) or figuratively (damage to reputation, plans, etc.).