unscrupulous; dishonest; irresponsible
Describes a person, action, or work that lacks conscience or moral scruples; often used for business practices, dealings, or shoddy work done without care.
That company's unscrupulous business practices are being called into question.
非良心的な工事で、すぐに壁にひびが入った。
Because of the irresponsibly done construction work, cracks soon appeared in the wall.