a man of few words
US /ə mæn əv fjuː wɜːrdz/
UK /ə mæn əv fjuː wɜːrdz/

1.
a person who does not speak much, especially one who only says what is necessary
:
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My grandfather was a man of few words, but when he spoke, everyone listened.
•
He's a man of few words, so don't expect a long explanation.