adjective
taciturn
TASS-ih-turn/ˈtæsɪtɜːrn/
Usually quiet and unwilling to talk.
My taciturn neighbor rarely says more than hello to anyone.

Etymology
Latin taciturnus described someone disposed to silence. Taciturn therefore describes a habitual reluctance to speak, rather than simply being quiet at a particular moment.
In context
as a dictator was formed during these years, he was a somewhat enigmatic character, one who displayed a large level of self-control and was reserved and introspective, nevertheless, despite his taciturn character
More examples
- Even among friends, Lena remains taciturn.
- His taciturn manner makes conversation difficult.
- Our taciturn coach prefers to demonstrate rather than explain.
Forms
taciturn
taciturnity noun — The habit of speaking very little.