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.
例句
My daughter is very difficult, uncommunicative and moody.我女兒很難相處，不愿跟人交流，又非常情緒化。
英英詞典釋義
Adjective
1. not inclined to talk or give information or express opinions