Definition of overzealous adjective from the Oxford Advanced Learner's Dictionary

 

overzealous

 adjective
adjective
BrE BrE//ˌəʊvəˈzeləs//
 
; NAmE NAmE//ˌoʊvərˈzeləs//
 
 
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showing too much energy or enthusiasm An overzealous fan ran onto the stage during the concert.
See the Oxford Advanced American Dictionary entry: overzealous