verb (used without object), enthused, enthusing.
to be or become enthusiastic; show enthusiasm: All the neighbors enthused over the new baby.
verb (used with object), enthused, enthusing.
to cause to become enthusiastic.

1820–30, Americanism; back formation from enthusiasm

quasi-enthused, adjective
unenthused, adjective

The verb enthuse is a 19th-century back formation from the noun enthusiasm. Originally an Americanism, enthuse is now standard and well established in the speech and all but the most formal writing of educated persons, in both Britain and the United States. It is used as a transitive verb meaning “to cause to become enthusiastic” (The liveliness of the dance enthused the audience) and as an intransitive verb meaning “to show enthusiasm” (She enthused warmly over his performance). Despite its long history and frequent occurrence, however, enthuse is still strongly disapproved of by many.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
enthuse (ɪnˈθjuːz)
to feel or show or cause to feel or show enthusiasm

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

1827, back formation from enthusiasm. Related: enthused.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Even his supporters seemed more loyal than enthused.
Don seems less than enthused over the prospect of renewed fatherhood.
Enthused work and extra-efforts that benefit or maximise growth, should be
The one working the galley was super-friendly, while the one working the aisle
  was a bit less enthused to be there.
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