noun
a person who is undemonstrative
adjective
not openly showing feelings or emotions
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The professor was known for being undemonstrative in his lectures, but his knowledge was unparalleled.
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She may seem undemonstrative, but she's actually a very caring person once you get to know her.
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I thought he was undemonstrative at first, but he's actually pretty cool once you hang out with him.
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His undemonstrative demeanor hid a deep well of emotions that he kept hidden from the world.