誠
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Faithfulness and fidelity to your boss or superior person.
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誠実
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Fidelity to your lover. (used as noun or na-adjective)
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正直
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Integrity in your dealings with everyone.
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堅実
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Reliability. 堅実 doesn’t have the moral aspect of words like 誠 or 誠実. 堅実 is more like, someone who works steadily, who doesn’t take chances, who is always on time, who is rock-solid and conservative.
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忠実
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Someone who is faithful in doing his/her duties. Also means like a movie which is faithful to the book, or a translation which is faithful to the original. Or even a forgery which copies the original dollar bill completely well.
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