watertight
/ˈwɔːtətaɪt/adjective
1- closely sealed, fastened, or fitted so that no water enters or passes through防水的, 不漏水的, 密封的, 水密的：
a watertight seal.
防水封口胶带。
1.1
- (of an argument or account) unable to be disputed or questioned（论点, 叙述）严密的, 无懈可击的：
their alibis are watertight.
他们的辩解无懈可击。