Where does “熱心” come from?

熱心 (Japanese) comes from Japanese 心, from Old Japanese 心, from Proto-Japonic *kəkərə — heart.

熱心 (Japanese): enthusiasm, zeal, fervor, earnestness

Definitions

  1. enthusiasm, zeal, fervor, earnestness

Ancestry of “熱心”, step by step

熱心 traces back through two separate lines of ancestry.

via Japanese 心

StepLanguageWordMeaning
1Japanese心mind, heart, spirit, soul; thoughts, ideas;...
2Old Japanese心heart, mind, spirit; emotion, feeling; heart,...
3Proto-Japonic*kəkərəheart

via Japanese 熱

StepLanguageWordMeaning
1Japanese熱fever; heat
2Middle Chinese熱—
Every word from Proto-Japonic *kəkərə →Every word from Old Japanese 心 →Every word from Japanese 心 →