If you comment on your best friend's taciturnity, it means that he is usually very quiet and reserved.

Use the noun taciturnity to describe the quality of people who don't reveal much information. A person's taciturnity might be a result of her shyness, her dislike of gossip and idle chatter, or her bad case of laryngitis. The Latin root of taciturnity is taciturnitatem, "a being or keeping silent," and it in turn comes from the Latin word for "silent," tacitus.

Definitions of taciturnity
  1. noun
    the trait of being uncommunicative; not volunteering anything more than necessary
    synonyms: reserve, reticence
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    type of:
    the trait of being uncommunicative
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