Modifiers matching neutral:

• dark,
• small,
• pale,
• new,
• warm,
• natural,
• energetic,
• soft,
• earthy,
• urban,
• abundant,
• impartial,

Simple categories matching earthy:

• item,
• substance,
• character,
• red,
• material,
• veggie,
• food,
• pigment,
• ingredient,
• component,
• constituent,
• scent,
• tone,
• matter,
• stone,
• elements,
• metal,
• vegetable,
• neutral,
• aroma,