taciturnity

noun

Etymology: From Middle English taciturnite, or alternatively from taciturn + -ity; both ultimately from Latin taciturnitās.

1. The trait of being taciturn.

   “Humphries broke out more freely into speech than he had done before, for his usual characteristic was that of taciturnity.”

   “Gernois’ cordiality was short-lived. No sooner had they ridden out of sight of Captain Gerard and his men than he lapsed once more into his accustomed taciturnity.”

2. Failure to assert a legal right in a way that implies that it is being given up.