incommunicative

/ˌɪnkəˈmjunɪkətɪv/
adjective
  1. Not willing to talk or share information; reserved or silent.
    • His incommunicative nature made it hard for the team to know what he was thinking.
    • After the argument, she became incommunicative and wouldn't answer any questions.
    • The new student was shy and incommunicative, keeping to himself in class.
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