impermeable

/ɪmˈpɜːmiəbl/ (bre, ipa) · /ɪmˈpɜːrmiəbl/ (ame, ipa) · /(ˌ)im-ˈpər-mē-ə-bəl/ (ame, mw)

impermeable — adjective

  • impermeablepositive
  • more impermeablecomparative
  • most impermeablesuperlative

1. describing a material or surface that liquids and gases cannot pass through — fo

1.形容詞B2
釋義

describing a material or surface that liquids and gases cannot pass through — for example, a plastic sheet that blocks water, or a clay layer that traps gas underground.

例句

The raincoat is made of an impermeable fabric that keeps you completely dry.

collocation: impermeable fabric

Engineers placed an impermeable clay layer to keep water out of the basement.

pattern: impermeable [material] + purpose clause

同義詞
  • waterproof

    more common in everyday language; specifically about water, not other fluids or gases

  • hermetically sealed

    much stronger — means perfectly airtight, often used for scientific containers

  • impervious

    broader — can also describe resistance to damage, criticism, or influence

反義詞
  • permeable

    the direct opposite — allows fluids to pass through

  • porous

    describes a material with tiny holes that let air or water through slowly

文法句型

impermeable + noun

impermeable to + noun

用法筆記

More formal and technical than 'waterproof'. While 'waterproof' applies only to water, 'impermeable' can describe resistance to any liquid or gas. The subject is usually a material, layer, or barrier — not an object's function. Frequently used in construction, geology, and manufacturing contexts.

常見錯誤

❌This bottle is impermeable.
✅This bottle is made of impermeable plastic.
💡'impermeable' describes the material, not the container itself.
❌The jacket is impermeable.
✅The jacket has an impermeable outer layer.
💡in everyday English, 'waterproof' is more natural for finished products; 'impermeable' describes the material or layer.