zealous

Zealous is an adjective describing a person or action marked by strong enthusiasm and dedication toward a cause, belief, or objective. A zealous individual demonstrates energetic commitment, often taking vigorous steps to advance their aims. The term can be neutral or positive when it conveys diligence and inspiration, but it can also imply excessive fervor or uncompromising persistence, which sometimes leads to intolerance or inflexibility. Common usages include zealous supporter, zealous advocate, or zealous pursuit of knowledge or faith.

Etymology and related terms: The word derives from Latin zelus via Old French zele and Middle English zele, ultimately from Greek zēlos meaning ardor or zeal. The related noun is zeal, and a person who displays zealous behavior may be described as a zealot. Related adjectives include zealous and, less commonly, zealful. Synonyms include ardent, fervent, enthusiastic, passionate, devout, and energetic; antonyms include indifferent, apathetic, dispassionate, and unconvinced.

Notes on usage: Zealous is often appropriate for describing strong, active commitment. In religious or political contexts, it can carry a positive sense of devotedness, or a negative sense of fanaticism if the zeal seems excessive or intolerant. The noun form zeal is commonly paired with adjectives or nouns that specify the focus of the zeal, such as “scientific zeal” or “zeal for justice.”