Taciturnity – the quality or state of being taciturn (habitually silent; not apt to talk)
“When Longfellow wrote a grief-stricken acquaintance that “there are natures whose native strength and elasticity enable them to endure the worst, and yet live,” he was stating from experience a principle to which he clung in his own way as tenaciously as Hemingway did to his code of masculine taciturnity or Emerson to his self-imposed emotional detachment from all but his immediate family and sometimes even them.”
Lawrence Buell, in the introduction to Henry Wadsworth Longfellow: Selected Poems