/ ɪnˌθjuːziˈæstɪk; NAmE -ˌθuː-/ adjective
enthusiastic (about sb/sth) | enthusiastic (about doing sth) feeling or showing a lot of excitement and interest about sb/sth :
an enthusiastic supporter
an enthusiastic welcome
You don't sound very enthusiastic about the idea.
She was even less enthusiastic about going to Spain.
► en·thu·si·as·tic·al·ly / -kli; NAmE / adverb
••
WORD ORIGIN
early 17th cent.: from Greek enthousiastikos , from enthous possessed by a god (based on theos god).