zeal

Enthusiastic devotion to a cause, ideal, or goal. synonym: passion.

To entertain zeal; be zealous.

Passionate ardor in the pursuit of anything; intense interest or endeavor; eagerness to accomplish or obtain some object.

Synonyms Earnestness, Enthusiasm, etc. (see eagerness), warmth, fervor, heartiness, energy.

Passionate ardor in the pursuit of anything; eagerness in favor of a person or cause; ardent and active interest; engagedness; enthusiasm; fervor.

A zealot.

To be zealous.

The fervor or tireless devotion for a person, cause, or ideal and determination in its furtherance; diligent enthusiasm; powerful interest.

prompt willingness

a feeling of strong eagerness (usually in favor of a person or cause)