full of or characterized by enthusiasm; ardent: He seems very enthusiastic about his role in the play.

1595–1605; < Greek enthousiastikós. See enthusiast, -ic

enthusiastically, adverb
antienthusiastic, adjective
antienthusiastically, adverb
hyperenthusiastic, adjective
hyperenthusiastically, adverb
nonenthusiastic, adjective
nonenthusiastically, adverb
overenthusiastic, adjective
overenthusiastically, adverb
pseudoenthusiastic, adjective
pseudoenthusiastically, adverb
quasi-enthusiastic, adjective
quasi-enthusiastically, adverb
unenthusiastic, adjective
unenthusiastically, adverb

eager, fervent, zealous, passionate, vehement, fervid, impassioned.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
enthusiastic (ɪnˌθjuːzɪˈæstɪk)
filled with or motivated by enthusiasm; fanatical; keen

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

c.1600, "pertaining to possession by a deity," from Gk. enthousiastikos, from enthousiazein (see enthusiasm). Meaning "pertaining to irrational delusion in religion" is from 1690s. The main modern sense, in reference to feelings or persons, "intensely eager, rapturous,"
is from late 18c. Earlier derogatory sense especially seems to have colored modern sense of enthusiast. Related: Enthusiastically.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
EU legislators have enthusiastically supported taxing airline emissions,
  approving the law last year.
Less encouraging was that the pilot and navigator enthusiastically joined in
  the toasting as bottle after bottle made the rounds.
Emma rears enthusiastically and places her forelegs around the bride's neck and
  licks her face.
Not having been there in years, they welcomed the idea enthusiastically.
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