unstable; insecure; precarious
Describes physical, emotional, economic, or systemic lack of stability. The gloss 'crankiness' is a rare, informal extension for a person's mood.
This desk is unstable because its legs are a bit wobbly.
彼は最近、情緒が不安定だ。
He has been emotionally unstable lately.
政情不安定な国では投資リスクが高い。
Investment risk is high in countries with political instability.
Recently, the economy has become unstable.
Unstable weather has been continuing.
He has been emotionally unstable lately.
That chair has short legs and wobbles precariously.
emotional instability
political instability