uncommunicative

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That it is so uncommunicative may simply be due to the fact that it is so new.
这些都很难说，原因也许很简单：这样的基金公司本事就是一个新的事物，这是事实。
When the man recovered, he showed no remorse, no gratitude; he just folded in on himself, cold and uncommunicative.
当那人恢复后，他没有懊悔，也没有感激，他蜷缩在自己的世界里，冷酷、寡言。
For a long time I believed there must be wealth of undiscovered treasure behind that uncommunicative manner, but late I wondered if there was anything behind it at all.
好长一段时间我都以为在那个沉默寡言的态度背后一定有着未曾挖掘出来的财宝，但后来我怀疑那背后是否有那些东西了。

Within a few days, David fell back into his old uncommunicative patterns.
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The 2, 436 pilots who belong to COPA can log on and jump into a chat in which Cirrus is being spit-roasted for its "shortsighted" management, "cheap" airplanes and "uncommunicative" owners.
FORBES: Magazine Article
The project has been commissioned by In-Q-Tel, a national-security-focused technology investment company funded by U.S. intelligence agencies, and has the mission of using virtual environments to let uncommunicative U.S. intelligence agencies interact with each other more efficiently and with more trust.
FORBES: Magazine Article

If you describe someone as uncommunicative, you are critical of them because they do not talk to other people very much and are unwilling to express opinions or give information.