ruinous (adj.)

• ablative
• annihilative
• baleful
• baneful
• bankrupt
• battered
• beat-up
• bedraggled
• biodegradable
• black
• blasted
• blighted
• blowzy
• broken
• broken-down
• calamitous
• careless
• cataclysmal
• cataclysmic
• catastrophic
• chintzy
• consuming
• consumptive
• corrosive
• crippling
• deadly
• decomposable
• decrepit
• degradable
• deleterious
• derelict
• destroyed
• destroying
• destructive
• devastating
• dilapidated
• dire
• disastrous
• disintegrable
• disintegrative
• disjunctive
• disruptive
• down-and-out
• draggled
• dusty
• erosive
• fallen
• fatal
• fateful
• finished
• frowzy
• frumpish
• frumpy
• fusty
• grievous
• grubby
• harmful
• informal
• injurious
• internecine
• irremediable
• kaput
• loose
• lumpen
• messy
• moldering
• moldy
• moss-grown
• moth-eaten
• mussy
• musty
• nasty
• negligent
• nihilistic
• noxious
• pernicious
• poisonous
• poky
• ragged
• ramshackle
• ravaged
• ravaging
• ruined
• run-down
• rusty
• scraggly
• seedy
• self-destructive
• separative
• shabby
• shattering
• shoddy
• slack
• slatternly
• slipshod
• sloppy
• slovenly
• slummy
• sluttish
• solvent
• sordid
• spoiled
• squalid
• stale
• subversive
• suicidal
• tacky
• tattered
• timeworn
• tottery
• toxic
• tragic
• undone
• unkempt
• unsightly
• untidy
• wasted
• wasteful
• withering
• worn
• wrecked