IPA: /ˌoʊvərɪnˈθjuːziˌæzəm/
KK: /oʊvərɪnˈθjuːziæzəm/
A very strong and excessive excitement or eagerness about something.
Her overenthusiasm for the project made everyone else feel pressured.
Overenthusiasm → It is formed from "over-" (meaning excessively) and "enthusiasm" (from Greek "enthousiasmos", meaning divine inspiration or intense excitement). The word "overenthusiasm" means an excessive or extreme level of excitement or eagerness.
Think of being 'excessively' ('over-') excited or inspired ('enthusiasm') — that's what overenthusiasm means.