zealousness

Eager, burning commitment

Zealousness is intense enthusiasm or fervor in pursuit of a cause, belief, or goal.

The word carries a slightly more formal or emphatic tone than simply saying enthusiasm: Her zealousness for environmental causes impressed even skeptics.

It can suggest admirable dedication or, in excess, fanaticism that others find off-putting.

fervor

ardor

Intense emotional warmth

passion · earnestness · intensity · fierceness · fanaticism · rapture · frenzy · exuberance · gusto · verve

devotion

dedication

Wholehearted loyalty to purpose

allegiance · constancy · adherence · commitment · piety · reverence · worship · adoration · veneration · single-mindedness

persistence

tenacity

Persistent grip or resolve

doggedness · relentlessness · tirelessness · industriousness · assiduousness · resolve · grit · stamina · endurance · fortitude

enthusiasm

eagerness

Intense willingness to act

exuberance · liveliness · zest · vim · vigor · dynamism · energy · drive · motivation · alacrity

Opposites
emotional intensity and engagement

zealousnessapathy

Absence of feeling

indifference · unconcern · disinterest · detachment · nonchalance

enthusiasm and energy

zealousnesslethargy

Abnormal drowsiness and apathy

listlessness · half-heartedness · torpor · languidness · sluggishness

temperament and disposition

zealousnesscoolness

Calm self-possession

coldness · dispassionateness · calmness · equanimity · moderation

Family

overzealousness

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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G