unstable
🇺🇸
/ʌnˈsteɪbl/
🇬🇧
/ʌnˈsteɪbl/
can change quickly and unpredictably
The weather is very unstable today.
今日の天気はとても不安定です。
someone whose mood or behavior changes often and unexpectedly
His moods are very unstable, changing from happy to sad very fast.
彼の気分はとても不安定で、幸せから悲しみへと非常に速く変わります。
something that might move or fall easily
The table is quite unstable; be careful putting anything heavy on it.
このテーブルはかなり不安定です;重いものを乗せる時は注意してください。
not remaining constant in its chemical composition
This compound is unstable and can change when exposed to light.
この化合物は不安定で、光にさらされると変化することがあります。