overconscientious

adjective
over·​con·​sci·​en·​tious | \ˌō-vər-ˌkän(t)-shē-ˈen(t)-shəs \

Definition of overconscientious 

: unduly or excessively conscientious : giving more thoughtful attention to something than is necessary or appropriate He can be overconscientious about following the rules. To her overworked and exasperated teachers she was an overconscientious "slow learner" who kept trying to catch up …— Tillie Olsen

First Known Use of overconscientious

1835, in the meaning defined above

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The first known use of overconscientious was in 1835

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