tacit-, taci-, tace- (Latin: silent, silence; unspoken; quiet).reticence: 
Maintenance of silence; avoidance of saying too much or of speaking freely; disposition to say very little or nothing.
 
reticent: 
Reserved; disinclined to speak freely; given to silence or concealment.
 
tace: 
The Latin for "Be silent!" According to the Oxford English Dictionary, "tace is Latin for a candle, a humorously veiled hint to any one to keep silent about something."
 
tacet: 
A musical instruction, or direction that the voice or instrument is to be silent for a time.
 
tacenda: 
Things to be passed over in silence; matters not to be mentioned.
 
tacit: 
1. Unspoken, unvoiced; silent, emitting no sound; noiseless, wordless.  
2. Not openly expressed or stated, but implied; understood, inferred. tacitly: 
1.  Without speaking; silently; quietly.  
2. Without stating or expressing anything; by implication. tacitness: 
The quality of being tacit; silence.
 
taciturn: 
Characterized by silence or disinclination to conversation; reserved in speech; saying little; uncommunicative.
 
taciturnist: 
One who practices habitual silence or reserve.
 
taciturnity: 
Habitual silence or disinclination to conversation; reservedness in speech; a taciturn character or state.
 
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