watertight

adjective

wa·​ter·​tight ˌwȯ-tər-ˈtīt 

ˌwä-

1

: of such tight construction or fit as to be impermeable to water except when under sufficient pressure to produce structural discontinuity

2

: leaving no possibility of misconstruction or evasion

a watertight lease

watertightness noun

Examples of watertight in a Sentence

The doors are all watertight.

The evidence against the defendant was watertight.

Recent Examples on the Web

Elsewhere, all the seasickness and disorientation — down to the sound of the bullets and the code names of Omaha Beach sectors — were factually watertight. —Tomris Laffly, EW.com, 6 July 2024

This is literally making sure the car is watertight and noise proof because sealing also stops noise getting in. —WIRED, 15 June 2023

Read the fine print before buying, as most are not watertight and will be destroyed by too much moisture. —Lorraine Wilde, Treehugger, 7 June 2023

This sizable sedan can also turn in a circle of less than 35 feet, and its longish tail provides a 17-cubic-foot trunk that also contains a pass-through to the rear seat with a watertight ski bootie. —Larry Griffin, Car and Driver, 7 Aug. 2023

Word History

First Known Use

15th century, in the meaning defined at sense 1

Kids Definition

watertight

adjective

wa·​ter·​tight ˌwȯt-ər-ˈtīt 

ˌwät-

1

: made to keep water out

a watertight compartment

2

: allowing no possibility for doubt or uncertainty

a watertight case against the accused