airtight
word
Definition
Airtight means not allowing air to enter or leave; completely sealed. It can also describe something so perfect or complete that nothing can go wrong.
Usage & Nuances
Used both literally (containers, windows) and figuratively (plans, arguments: 'airtight alibi'). Common collocations: 'airtight container', 'airtight seal', 'airtight case'. Often formal or technical when literal; figurative use is more common in written and spoken English.
Example Sentences
The jar has an airtight lid.
basic
Keep the cookies in an airtight container.
basic
The scientist made sure the room was airtight.
basic
Make sure the bottle is completely airtight, or the soda will go flat.
natural
His argument was airtight; nobody could find a single flaw.
natural
My lawyer said we have an airtight case, so I feel confident.
natural