英 [ˈkləʊsˈmaʊðd] 美 [ˈkloʊsˈmaʊðd]
嘴紧的
inclined to secrecy or reticence about divulging information
同义词： close / closelipped / secretive / tightlipped
... close 关 closemouthed 寡言的 closelipped 守口如瓶的 ...
But Cheney's closemouthed approach to his medical history has only encouraged more questions about it.