tacit-, taci-, tace-

(Latin: silent, silence; unspoken; quiet)

taciturn, taciturnly
1. Characterized by silence or a disinclination to conversation.BR> 2. Reserved in speech; saying little; uncommunicative.
3. Habitually untalkative.
taciturnist
One who practices habitual silence or reserve.
taciturnity
Habitual silence or disinclination to conversation; reservedness in speech; a taciturn character or state.

Silence words. More silence-content words at these links: mute and silen-.