Modifiers matching obstacle:

• institutional,
• natural,
• common,
• creative,
• physical,
• single,
• rigid,
• psychological,
• tall,
• urban,
• underground,
• permanent,
• artificial,
• fixed,
• high,
• removable,
• interfering,
• typical,
• opaque,
• porous,
• solid,
• impenetrable,
• dangerous,
• advanced,
• outdoor,
• thick,
• large,
• environmental,
• tricky,
• linear,
• elevated,
• unmovable,
• geological,
• adjacent,
• structural,
• vertical,
• rectangular,
• narrow,
• clear,
• size,
• penetrating,
• concrete,
• additional,
• over,
• unusual,
• practical,
• geographic,
• hazardous,
• visual,
• moving,
• nearby,
• everyday,
• distant,
• local,
• extensive,
• dynamic,
• overhead,
• simple,
• architectural,
• dense,
• stationary,
• rural,
• private,
• movable,
• small,
• soft,
• wooden,
• static,
• world,
• multiple,
• working,
• external,
• passive,
• coming,
• difficult,
• special,
• mechanical,

Simple categories matching unmovable:

• object,
• surface,
• thing,
• obstacle,