资料来源 : Webster's Revised Unabridged Dictionary (1913)

Vacuousness \Vac"u*ous*ness\, n.
   The quality or state of being vacuous; emptiness; vacuity.
   --W. Montagu.

资料来源 : WordNet®

vacuousness
     n : total absence of matter [syn: {vacuity}]