airtight

The airtight container kept the cookies fresh for days.

The detective's alibi was airtight, proving his innocence.

The contract was airtight, leaving no room for negotiation.

The airtight seal on the door prevented any sound from escaping the room.

She presented an airtight argument that convinced everyone in the room.

The airtight defense strategy ensured the team's victory.

The scientist conducted experiments in an airtight chamber to control the environment.

The airtight packaging kept the fragile items safe during shipping.

The lawyer advised his client to create an airtight will to avoid any disputes among family members.

The airtight alibi provided by the witness cleared the suspect of any involvement in the crime.