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
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Merriam-Webster unabridged
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Time Traveler for overconscientious
The first known use of overconscientious was in 1835
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