In a state of severe disrepair or neglect, often appearing ready to collapse. The ramshackle old house at the end of the street looked like it hadn't been lived in for decades.
Poorly constructed or maintained, lacking stability or soundness. The ramshackle bridge swayed dangerously as we crossed it, making us question its safety.
Lacking clear organization or order; chaotically put together. The proposal was nothing more than a ramshackle collection of ideas hastily assembled before the meeting.