
Watertight
Physical Barrier
Refers to actual objects that prevent water passage.

Make sure the container is watertight before we submerge it.
Emphasize Reliability
Implies that something can be completely trusted not to fail.

The watertight watch remained functional even after swimming.
Literal Use
Used to describe actual objects that contact water, like boats or containers.

Your diving suit is watertight, ensuring you stay dry.
Compare with
AirtightImpenetrableInvulnerableSealSecureTightUnassailableWaterproof
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