Where does “不安定” come from?

不安定 (Japanese) comes from Japanese 不, from Middle Chinese 不.

不安定 (Japanese): unstable

Definitions

  1. unstable

Ancestry of “不安定”, step by step

不安定 traces back through two separate lines of ancestry.

via Japanese 不

StepLanguageWordMeaning
1Japanese不un-, non-, in-; bad, poor
2Middle Chinese不—

via Japanese 安定

StepLanguageWordMeaning
1Japanese安定stability; to even out, to stabilize
Every word from Middle Chinese 不 →Every word from Japanese 不 →