taciturn

/ˈtæsɪtɜrn/
adjective
  1. Tending to speak very little; reserved or quiet in conversation.
    • Her uncle was a taciturn man who rarely said more than a few words at dinner.
    • In the meeting, the boss was unusually taciturn, letting others do all the talking.
    • The new student seemed taciturn at first, but opened up after a few weeks.
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