unthinkable, out of the question

practical question (problem)

observatory (place where celestial bodies are observed)

set of problems

(informal) ass; arse; buttocks / (informal) gay sex, sex between two men / (informal) last or hindermost part

決断: decision / 結団: formation of an organization

a thing that has lowered its own value badly

to drop in value badly

to fall / (computing) to go down (as when a computer or application becomes unresponsive) / (electrical engineering, of a circuit breaker) to trip / (informal) to fail an examination

Alternative form of 落ちる