tumbledown (?.)

• battered
• beat-up
• beaten up
• broken-down
• collapsing
• crumbling
• deciduous
• declining
• declivitous
• decrepit
• decurrent
• derelict
• descendant
• descending
• dilapidated
• disintegrating
• doddering
• down
• down-reaching
• downcoming
• downfalling
• downgoing
• downhill
• downsinking
• downward
• drooping
• dropping
• falling
• groggy
• in ruins
• on the descendant
• on the downgrade
• plummeting
• plunging
• ramshackle
• ricketish
• rickety
• rocky
• ruined
• ruinous
• run-down
• sagging
• setting
• shaky
• sinking
• slummy
• spidery
• spindly
• submerging
• subsiding
• teetering
• teetery
• tottering
• tottery
• unsteady
• wobbly