ardently active, devoted, or diligent; full of, characterized by, or due to zeal. enthusiastic, eager, fervid, fervent, intense, passionate, warm. apathetic; lackadaisical.

1520–30; < Medieval Latin zēlōsus. See zeal, -ous

zealously, adverb
zealousness, noun
nonzealous, adjective
nonzealously, adverb
nonzealousness, noun
pseudozealous, adjective
pseudozealously, adverb
quasi-zealous, adjective
quasi-zealously, adverb
superzealous, adjective
superzealously, adverb
superzealousness, noun
underzealous, adjective
underzealously, adverb
underzealousness, noun
unzealous, adjective
unzealously, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
zealous (ˈzɛləs)
filled with or inspired by intense enthusiasm or zeal; ardent; fervent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1520s, from M.L. zelosus (cf. It. zeloso, Sp. celoso), from zelus (see zeal). Related: Zealously, zealousness.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
His zealousness shocked the arbitrage business, which had been accustomed to
  small, cautious investments.
Yet, zealousness still characterizes reform efforts at the middle level.
Students, in their zealousness to make sure the brakes respond rapidly, have a
  tendency to reduce travel to less than the minimum.
It was pointed out their harnessed zealousness would have its benefits in any
  national defense need.
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