wa·ter·tight /ˌwɔtɚ/
(a.)水泄不通的,不漏水的,無懈可擊的
watertight
adj 1: having no leaks [syn: leakproof]
2: not allowing water to pass in or out
3: without flaws or loopholes; "an ironclad contract"; "a
watertight alibi"; "a bulletproof argument" [syn: ironclad,
unassailable, unshakable, bulletproof]