Definition of zealous adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈzeləs//
; NAmE NAmE//ˈzeləs//
(formal) Energetic
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showing great energy and enthusiasm for something, especially because you feel strongly about it a zealous reformer See related entries: Energetic Word Originearly 16th cent.: from a medieval Latin derivative of Latin zelus ‘zeal, jealousy’.
See the Oxford Advanced American Dictionary entry: zealous