non·en·ti·ty /-ˈɛntəti, ˈɛnə-/
  不存在,非實在,虛無
  Non·en·ti·ty n.; pl. Nonentities
  1. Nonexistence; the negation of being.
  2. A thing not existing.
  3. A person or thing of little or no account; an unimportant person; -- usually used as a disparaging term. [Colloq.]
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  nonentity
       n 1: the state of not existing [syn: nonexistence] [ant: being]
       2: a person of no influence [syn: cipher, cypher, nobody]
       3: a nonexistent thing [syn: nothing]