impermeable

adjective

preventing especially liquids to pass or diffuse through
特に液体が通り抜けるまたは染みわたることを防ぐ
- impermeable stone
  不浸透性の石
- an impermeable layer of scum
  カスの不透過性の層
- a coat impermeable to rain
  雨を通さないのコート

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