airtight

/ˈeətaɪt/ (bre, ipa) · /ˈertaɪt/ (ame, ipa) · /ˈer-ˌtīt/ (ame, mw)

airtight — adjective

  • airtightpositive
  • more airtightcomparative
  • most airtightsuperlative

1. designed or closed so tightly that air cannot pass into or out of it

1.形容詞B2
釋義

designed or closed so tightly that air cannot pass into or out of it

例句

Emma stored the homemade jam in an airtight jar to keep it fresh.

collocation: airtight jar / airtight container

The laboratory door must remain airtight to prevent dangerous gases from leaking out.

同義詞
  • sealed

    more general; can mean closed by glue, wax, or fastening without implying complete air blockage

  • hermetic

    more technical, usually describing laboratory or industrial seals

  • leakproof

    focuses on liquid or gas escaping rather than air entering

反義詞
  • leaky

    allows air or liquid to pass through

  • porous

    has tiny holes that air can pass through

文法句型

airtight + noun

用法筆記

Most often used before a noun describing a container, package, door, or room. In scientific writing it also describes laboratory equipment or sample storage conditions.

常見錯誤

❌Store the food in an airproof container.
✅Store the food in an airtight container.
💡'Airproof' is non-standard; the correct compound is 'airtight'.

2. so carefully planned or prepared that it has no mistakes or weak points, and not

2.形容詞B2
釋義

so carefully planned or prepared that it has no mistakes or weak points, and nothing can be questioned

例句

The prosecution presented an airtight case with DNA evidence and three witnesses.

collocation: airtight case (legal context)

Diego prepared an airtight argument that the committee could find no fault with.

同義詞
  • watertight

    interchangeable in figurative use, though more common in British English for legal arguments

  • foolproof

    focuses on being impossible to get wrong, used for plans or systems

  • unassailable

    stronger tone, suggests the argument cannot be attacked at all

  • flawless

    broader meaning; not restricted to argumentative or legal contexts

反義詞
  • flawed

    having mistakes or weaknesses

  • weak

    easily questioned or challenged

文法句型

airtight + noun (case/argument/plan)

be/look/seem + airtight

用法筆記

Frequently used in legal contexts (airtight case, airtight alibi) and in discussions of arguments, plans, or security measures. The object is always something abstract — a case, argument, plan, logic, alibi, or proof.

常見錯誤

❌The lawyer built an airproof case.
✅The lawyer built an airtight case.
💡Even in figurative use the correct word is 'airtight', not 'airproof'.