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[zel-uh s] /ˈzɛl əs/
full of, characterized by, or due to zeal; ardently active, devoted, or diligent.
Origin of zealous
1520-30; < Medieval Latin zēlōsus. See zeal, -ous
Related forms
zealously, adverb
zealousness, noun
nonzealous, adjective
nonzealously, adverb
nonzealousness, noun
underzealous, adjective
underzealously, adverb
underzealousness, noun
unzealous, adjective
unzealously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for zealousness
Historical Examples
  • In his zealousness Mr. Dolman might anger her husband, then his logic would avail little.

    Thoroughbreds W. A. Fraser
  • Into eyes and lips alike came something else—something touched with the zealousness of aspiration.

    When 'Bear Cat' Went Dry Charles Neville Buck
  • With these two cold, stern men to nod approval at his zealousness, he went to greater lengths than he might otherwise have done.

    Joel: A Boy of Galilee Annie Fellows Johnston
British Dictionary definitions for zealousness


filled with or inspired by intense enthusiasm or zeal; ardent; fervent
Derived Forms
zealously, adverb
zealousness, 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
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Word Origin and History for zealousness



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

Online Etymology Dictionary, © 2010 Douglas Harper
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