Translation guide
Describes something that is completely sealed against water, or an argument, plan, or case that has no weaknesses or loopholes.
Describing a container, compartment, or seal that does not allow water to enter or escape.
General term for waterproof or water-resistant. Often used for watches, clothing, and electronics.
Describing a case, alibi, argument, or plan that has no weaknesses or loopholes.
Do not translate 'watertight' literally as 水が漏れない (water doesn't leak) for arguments or plans. Use the metaphorical expressions provided.
この時計は防水です。
This watch is watertight.
Specifically means watertight, often used in engineering or technical contexts for compartments or seals.
船の水密区画が浸水を防いだ。
The ship's watertight compartments prevented flooding.
Literally 'water does not enter'. A simple, natural way to describe something as watertight in everyday speech.
この容器は水が入らないようになっている。
This container is made to be watertight.
Means hermetically sealed or airtight, but can imply watertightness when context is about liquids.
密閉容器に入れて保存してください。
Please store it in a watertight container.
Means perfect or flawless. Commonly used for plans, arguments, or alibis that cannot be challenged.
彼のアリバイは完璧だ。
His alibi is watertight.
Literally 'has no gaps'. Very natural for describing a watertight argument or defense.
彼の論理は隙がない。
His logic is watertight.
Means 'no room to take advantage of'. Emphasizes that there is no loophole to exploit.
その契約書は付け入る隙がない。
The contract is watertight.
Means 'no fault to find'. Used for something that is beyond criticism, like a watertight case.
彼の主張は非の打ち所がない。
His argument is watertight.
Means solid, sound, or reliable. Can describe a watertight plan or strategy.
堅実な計画を立てよう。
Let's make a watertight plan.