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watertight

watertight

1 5.1
So strong and complete that people cannot prove it wrong
  • adjective
  • /ˈwɔːtərˌtaɪt/
translation icon : irrefutable
  • The lawyer crafted a watertight argument that convinced the jury of her client's innocence.
  • watertight case

She said it would be good practice to get that recipe absolutely exact and watertight.

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Examples

  • The thing is that with its consistent and largely watertight direction, Shin Sekai Yori has made it seem that everything was planned from the get-go.

    Blog text (13)
  • We don't have a watertight case.

  • Not exactly a watertight case, is it?

  • And even if you could get out, that contract is watertight.

  • He's asking questions that are highly relevant to writing a watertight ruling on the issue.

    Blog text (29)
  • Now, I've got a strong case, ready to go, but your testimony will make it watertight.

  • Moyes has always believed in building from the back; a watertight defense is a prerequisite no matter the circumstances.

    Blog text (32)
  • That seems watertight.

    Blog text (16)
  • Now I am well aware, Monsieur Poirot, that in your world when a murder takes place everyone automatically comes up with a watertight alibi.

  • Of course, I also wonder if it has anything to do with not pursuing a case that is not watertight, and which could be a waste of public funds/not in public interest/etc.

    Blog text (20)

Synonyms

airtight
vswatertight
29 5.9

A very strong argument or plan that has no weak points

is about having no errors or loopholes in a case or plan
bulletproof
vswatertight
21 5.8

Hard to prove wrong

focuses specifically on absence of errors or gaps in reasoning
ironclad
vswatertight
15 7.4

Very strict and impossible to change

applies to well‑made arguments rather than to strict unchangeability
unassailable
vswatertight
11 8.0

So strong that no one can attack, defeat, or prove it wrong

stresses lack of disprovable errors rather than general invulnerability
unshakable
vswatertight
  • US
8 4.8

Very strong belief or feeling that cannot be changed

emphasizes being error‑free rather than simply very certain
weathertight
vswatertight
5.3

So complete and strong that no one can find a flaw

refers to arguments that leave no disprovable flaws or holes

Compounds

Strong, clear proof that shows someone was not at a crime scene

How Convincing

irrefutable
22 7.8
watertight
1 5.1
convincing
195 3.4
plausible
129 7.2
flawed
182 3.7

Surface Forms

watertight positive

Morphology

watertight = water + tight (semi-transparent) = water + tight

The figurative sense ('secure, without loopholes') is an extension from the literal 'not allowing water through' and is inferable but requires metaphorical mapping.

Etymology

Watertight is also used for ideas and plans because it comes from water + tight, which suggests 'no holes' to let anything in. So a watertight argument has no gaps and cannot be easily attacked.