uncommunicativeness

/ˌʌnkəˈmjunəkətɪvnəs/
noun
  1. The quality of being unwilling or unable to talk or share information, thoughts, or feelings.
    • After the argument, a wall of uncommunicativeness grew between them.
    • Her uncommunicativeness made it hard for the team to know what she was thinking.
    • The therapist tried to understand the source of his uncommunicativeness.