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

The shells, which are watertight and surprisingly sturdy, usually can be completed for a project in 24 hours. —Sam Lubell, Los Angeles Times, 9 May 2025

Subjected to an almost watertight international arms embargo, Iran was forced to rely mostly on self-sufficiency, religious zeal, and patriotism. —Foreign Affairs, 25 Feb. 2025

Des Cars wrote that parts of the museum are no longer watertight, posing a risk to the art’s safety. —Madeline Fitzgerald, Quartz, 28 Jan. 2025

The Woods Hole underwater acoustic system includes off-the-shelf components in a watertight Pelican case. —IEEE Spectrum, 20 Nov. 2024

Word History

First Known Use

15th century, in the meaning defined at sense 1

Rhymes for watertight

• acolyte
• aconite
• allanite
• alunite
• amberlite
• ammonite
• amorite
• amphitrite
• analyte
• anchorite
• andesite
• anhydrite

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