For someone who is honest and follows good moral standards, use the adjective ethical. An ethical teacher will grade your papers honestly — even if she catches you sticking your tongue out at her.

Ethical comes from the Greek ethos "moral character" and describes a person or behavior as right in the moral sense - truthful, fair, and honest. Sometimes the word is used for people who follow the moral standards of their profession. An ethical lawyer or doctor does not try to take advantage of the client or patient's unfortunate situation. If something has happened and you are not sure what the right thing to do is, you are having an ethical dilemma.

Definitions of ethical

adj conforming to accepted standards of social or professional behavior

“an ethical lawyer”
ethical medical practice”
“an ethical problem”
“had no ethical objection to drinking”
“"Ours is a world of nuclear giants and ethical infants"- Omar N. Bradley”
in conformance with justice or law or morality
not conforming to approved standards of social or professional behavior
contrary to conscience or morality or law
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adj adhering to ethical and moral principles

“it seems ethical and right”
honorable, honourable
in conformance with justice or law or morality

adj of or relating to the philosophical study of ethics

ethical codes”
ethical theories”

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