Modifiers matching membrane:

• biological,
• resonant,
• multicellular,
• active,
• macromolecular,
• heterogeneous,
• logical,
• collagenous,
• elastic,
• fetal,
• vascular,
• metallic,
• flexible,
• intact,
• protective,
• thin,
• impermeable,
• mucous,
• thick,
• moist,
• permeable,
• continuous,
• waterproof,
• excitable,
• pliable,
• porous,
• intracellular,
• extracellular,
• refractory,
• cellular,
• impervious,
• epithelial,
• mucosal,
• homogeneous,
• internal,
• imperforate,
• proteinaceous,
• synthetic,
• inorganic,
• nonporous,
• natural,
• biologic,
• sensitive,
• warm,
• circular,

Simple categories matching impermeable:

• pavement,
• molecule,
• surface,
• material,
• enclosure,
• object,
• cover,
• wall,
• rock,
• filler,
• component,
• membrane,
• fabric,
• container,
• plastic,
• deposit,
• structure,
• fluid,
• formation,
• condom,
• metal,
• barrier,
• coating,
• sheet,
• matter,
• polymer,
• medium,
• substrate,
• sediment,
• soil,
• covering,
• layer,
• unit,
• area,
• particle,
• compound,
• sphere,
• reservoir,
• solute,
• glove,
• means,
• substance,
• earth,
• stone,
• region,