uncommunicative

形容词 uncommunicative:

1. not inclined to talk or give information or express opinions
   同义词：incommunicative

1. Formerly cautious to the point of being uncommunicative, my companions had changed out of recognition.
   我们的同伴们过去谨小慎微得几乎不开口说话，可现在他们变得判若他人了。