vacuity
n.
late 14c., "hollow space," from Latin vacuitas "empty space, emptiness, absence, vacancy, freedom," from vacuus "empty" (see vacuum, n.). Originally in anatomy. Meaning "vacancy of mind or thought" is attested from 1590s.
〔李〕[vac;-u-;-ityn.] n.空，空虚； 真空； 空间； 精神空虚 ←vac,van (L vacare,vanus)=to be empty 空
〔蒋〕[vacu空，-ity名词后缀，表示情况，状态] 空，空白，空虚