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
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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
Gentlemen were neither fervid nor zealous, and above all they were not
My office is always seeking motivated and enthusiastic college students
  interested in interning for academic credit.
Even the most enthusiastic of elves needs a break from shopping sometimes.
Three words someone else would use to describe me are enthusiastic, curious and
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