[そら, sora](n) (1) empty air; sky; (2) { Buddh } shunya (emptiness, the lack of an immutable intrinsic nature within any phemomenon); (3) (abbr) (See 空軍) air force; (n, adj-na) (4) fruitlessness; meaninglessness; (5) (See 五大・1) void (one of the five elements)#1345[Add to Longdo]
[はいていらおゆえ, haiteiraoyue](n) totally useless (fruitless) effort; wasting time on an impossible task (like trying to scoop up a reflected moon from the bottom of the sea)[Add to Longdo]