over-conscientious

adjective

1. governed by conscience; controlled by or done according to one’s inner sense of what is right; principled: She’s a conscientious judge, who does not let personal prejudices influence her decisions.
2. careful and painstaking; particular; meticulous; scrupulous: conscientious application to the work at hand.

adjective

1. involving or taking great care; painstaking; diligent
2. governed by or done according to conscience

adj.1610s, from Middle French conscientieux (16c.; Modern French consciencieux), from Medieval Latin conscientiosus, from conscientia (see conscience). Related: Conscientiously; conscientiousness.