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Adjective: enthusiastic  in,th(y)oo-zee'as-tik
  1. Having or showing great excitement and interest
    "enthusiastic crowds filled the streets"; "an enthusiastic response"; "was enthusiastic about taking ballet lessons";
    - keen

See also: ardent, avid, crazy, dotty [informal], evangelical, evangelistic, gaga [informal], glowing, gung ho, overenthusiastic, passionate, spirited, warm, wild, zealous

Antonym: unenthusiastic

Encyclopedia: Enthusiastic