Modifiers matching terrain:

• unstable,
• open,
• homogeneous,
• dangerous,
• complex,
• irregular,
• regular,
• grassy,
• uneven,
• broad,
• difficult,
• flat,
• rough,
• rugged,
• sensitive,
• over,
• geophysical,
• varied,
• diverse,
• featureless,
• large,
• hazardous,
• exciting,
• barren,

Simple categories matching barren:

• rock,
• area,
• ground,
• land,
• terrain,
• mineral,
• environment,
• community,