watertights

the lawyer presented a watertight argument that convinced the jury.

we need a watertight seal to prevent any leaks in the basement.

their alibi was watertight, so the police had to release them.

make sure the contract is watertight before you sign it.

the submarine has several watertight compartments for safety.

his explanation was watertight and left no room for doubt.

the new security system is completely watertight.

they developed a watertight plan to escape unnoticed.

the regulations are watertight and leave no loopholes.

this container is watertight, perfect for storing liquids.

her logic was watertight, making it impossible to argue.

the dam's watertight barrier has protected the city for decades.