undemonstrative
adjective
UK: /ˌʌndɪˈmɒnstrətɪv/
US: /ˌʌndɪˈmɑːnstrətɪv/
Not showing feelings openly; reserved in expressing emotions.
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He is quiet and undemonstrative, so people think he is unfriendly.
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Despite his gruff exterior, he was deeply fond of his family, though undemonstrative.
Lacking outward expression of emotion or affection; restrained.
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My father was an undemonstrative man, rarely showing affection.
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She remained undemonstrative during the presentation, making it hard to gauge her reaction.