overenthusiastic

adjective
over·en·thu·si·as·tic | \ ˌō-vər-in-ˌthü-zē-ˈa-stik , -en- also -ˌthyü- \

Definition of overenthusiastic 

: having or showing an excessive degree of enthusiasm : overly enthusiastic … was minding his own business at a computer conference when an apparently overenthusiastic fan gave him a kind of bear hug around the neck, which wrenched some vertebrae … —Ron Rosenbaum and Marissa Martinelli Indeed, he thinks many in the press and business community may be a little overenthusiastic about how soon many of these new technologies will have an impact. —Patricia Panchak … he made an overenthusiastic lunge from the stage and tore cartilage in his knee. —Judith Jacklin Belushi

Other words from overenthusiastic

overenthusiastically \ˌō-vər-in-ˌthü-zē-ˈa-sti-k(ə-)lē, -en- also-ˌthyü- \ adverb
… I played it willingly, throwing myself into it overenthusiastically because I had few prospects and little choice. —Evangeline Henry

First Known Use of overenthusiastic

1857, in the meaning defined above

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The first known use of overenthusiastic was in 1857

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