このところ天気が不安定で、急に雨が降り出すことが多い。
The weather has been unstable lately, and it often starts raining suddenly.
彼は仕事を失ってから精神的に不安定になった。
He became emotionally unstable after losing his job.
収入が不安定なので、なかなか家を買う決心がつかない。
My income is unsteady, so I can't bring myself to buy a house.