IPA: /ɪnˈθuːziˌæstɪk/
KK: /ɪnˈθuːziˌæstɪk/
Showing a lot of excitement and interest about something.
She was enthusiastic about starting her new job.
Enthusiastic → It is formed from "enthousiasmos" (from Greek ἐνθουσιασμός, meaning divine inspiration or possession) and the suffix "-ic" (meaning pertaining to). The word "enthusiastic" describes a state of being inspired or filled with intense excitement or eagerness.
Think of being filled with 'divine inspiration' ('enthousiasmos') — that's why enthusiastic means being very excited or eager.