adj
airtight
adj
1
Sealed so tightly that no air or gas can pass in or out.
"Store the coffee in an airtight container to keep it fresh."
2
So carefully reasoned or well-supported that it has no weak points; impossible to refute.
"The prosecutor built an airtight case against the defendant."
"His alibi was airtight — three witnesses confirmed his location."
How to Use Airtight
Learner’s notesIn plain EnglishEither sealed so no air can get through, or (for an argument or plan) so solid that no one can find a flaw in it.
Common pairings
an airtight seal
an airtight alibi
an airtight argument
Word Forms
more airtight comparative, most airtight superlative
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Etymology
From air + tight, first used literally of seals and containers, later extended figuratively to arguments and plans with no flaws.