Modifiers matching foundation:

• larger,
• solid,
• personal,
• legal,
• large,
• permanent,
• subjective,
• overhead,
• big,
• major,
• general,
• stable,
• related,
• key,
• educational,
• musical,
• good,
• temporary,
• foreign,
• heavier,
• charitable,
• level,
• huge,
• unyielding,
• firm,
• powerful,
• light,
• economic,
• cosmetic,
• alternative,
• theoretical,
• traditional,
• mathematical,
• resistant,
• local,
• nonprofit,
• philanthropic,
• rigid,
• american,
• public,
• essential,
• strong,
• independent,
• coarse,
• concrete,
• scientific,
• active,
• benevolent,
• conceptual,
• spiritual,
• influential,
• outside,
• compliant,
• common,
• corporate,
• civilian,
• academic,
• religious,
• international,
• important,

Simple categories matching unyielding:

• matter,
• surface,
• material,
• object,
• fabric,
• equipment,
• area,
• item,
• body,
• envelope,
• structure,
• foundation,