Modifiers matching ground:

• paved,
• under,
• weak,
• neutral,
• soft,
• shiny,
• over,
• clean,
• grown,
• firm,
• high,
• clear,
• rough,
• rigid,
• hard,
• level,
• familiar,
• private,
• particular,
• softer,
• permeable,
• durable,
• sensitive,
• working,
• flat,
• waterlogged,
• stable,
• woven,
• disturbed,
• low,
• open,
• bad,
• off,
• barren,
• irregular,
• holy,
• vertical,
• uncultivated,
• sized,
• unstable,
• sandy,
• technical,
• up,
• elevated,
• higher,
• artificial,
• heavy,
• metal,
• white,
• sacred,
• wet,
• porous,
• electrical,
• old,
• dry,
• rocky,
• harder,
• common,
• good,
• mechanical,
• natural,
• difficult,
• unsecured,
• moist,
• undisturbed,
• uneven,
• coarse,
• new,
• conductive,
• safe,
• loose,
• hazardous,
• slippery,
• convenient,
• dangerous,
• metallic,
• routine,

Simple categories matching uneven:

• material,
• ground,
• surface,
• pattern,
• area,
• pavement,
• path,
• decoration,
• terrain,
• grounds,
• object,
• substrate,