unvocal

/ʌnˈvoʊkəl/
adjective
  1. Not expressing opinions or feelings openly; reserved or quiet.
    • In meetings, he was usually unvocal, preferring to listen rather than speak.
    • She remained unvocal during the debate, even though she had strong views.
    • The committee was surprisingly unvocal about the proposed changes to the park.
Antonyms
What does "unvocal" mean? | whatsthatwordmean | whatsthatwordmean