airtight

• 形容某物密封得使空气无法进入或逸出；也用于比喻，指某事无懈可击、无法质疑或反驳。

Describes something that is sealed so that no air can enter or escape; also used figuratively to mean impossible to dispute or question.

1. Sealed against airB1formal

   Not allowing air or gas to pass in or out.

   密封的

   • The container is airtight to keep the food fresh.
   • Airtight seals are essential for vacuum packaging.
   • The laboratory uses airtight chambers for experiments.

   同义词gas-tighthermeticimpermeableleakproofsealed

   反义词leakypermeableporousventilated

2. Flawless or unassailableB2informal

   Having no weak points; impossible to disprove or argue against.

   无懈可击

   • The lawyer presented an airtight case to the jury.
   • Her argument was so airtight that no one could challenge it.
   • He has an airtight alibi for the night of the crime.

   同义词impregnableincontrovertibleindisputableinvulnerableirrefutablesoundunassailablewatertight

   反义词assailableflawedpenetrablequestionablerefutablevulnerable