[zel-uh s]


full of, characterized by, or due to zeal; ardently active, devoted, or diligent.

Origin of zealous

From the Medieval Latin word zēlōsus, dating back to 1520–30. See zeal, -ous
Related formszeal·ous·ly, adverbzeal·ous·ness, nounnon·zeal·ous, adjectivenon·zeal·ous·ly, adverbnon·zeal·ous·ness, nounun·der·zeal·ous, adjectiveun·der·zeal·ous·ly, adverbun·der·zeal·ous·ness, nounun·zeal·ous, adjectiveun·zeal·ous·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for zealous



filled with or inspired by intense enthusiasm or zeal; ardent; fervent
Derived Formszealously, adverbzealousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for zealous

1520s, from Medieval Latin zelosus (source of Italian zeloso, Spanish celoso), from zelus (see zeal). Related: Zealously, zealousness.

Online Etymology Dictionary, © 2010 Douglas Harper