tending not to speak much
taciturn - reserved
A person described as being ‘taciturn’ does not speak very often and when they do they tend to say very little. Such behaviour is typically not due to shyness, more a personality trait, but it can come across as being cold and unfriendly.
The client was quite a taciturn man and only gave me one word responses.
Beneath his taciturn demeanour, John is actually a very kind-hearted guy.
Anna said very little at lunch today. Such taciturnity was unlike her, so she must have had something on her mind.