Compounds of 空論

• 空論
  (n,adj-no) abstract or impracticable theory
• 空論家
  (n) a doctrinaire
• 机上空論
  (n) impractical desktop theory (proposition)
  unworkable idea
  an idea that isn't worth the paper it's written on
• 空理空論
  (n) impractical or useless theory
• 机上の空論
  (n) academic gossip
  empty theory