Longman Dictionary of Contemporary English homepage

ruinous

 adjective
     
ru‧in‧ous
1 causing a lot of damage or problems:
a ruinous civil war
2 costing much more than you can afford:
ruinous rates of interest
3 formal a building that is ruinous has been almost completely destroyed [= ruined]:
an old ruinous chapel
ruinous state/condition
the ruinous state of the city walls
—ruinously adverb:
ruinously expensive
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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