earnestness; sincere enthusiasm
A somewhat formal, literary term for wholehearted dedication or fervor. Often used in written contexts to describe a person's attitude or effort.
I was moved by his earnest attitude.
I tackle my work with sincere enthusiasm.
Compound of 熱 (heat, passion) and 誠 (sincerity). The exact historical derivation is uncertain, but the combination conveys passionate sincerity.