熱誠

ねっせい【熱誠】

fiery earnestness; ardor; warmth; enthusiasm; burning [passionate] sincerity.

●熱誠あふれる面持ちで with a look of passionate sincerity (on one's face [in one's eyes]).

●熱誠を込めて heart and soul; with all one's heart; enthusiastically; zealously.