“Good faith” in Japanese
Short answer
Good faith in Japanese is “誠意” (seii). Full meaning: sincerity, good faith.
Other ways to say “Good faith” in Japanese
真実味
shinjitsumi truthfulness, credibility; sincerity, honesty, good faith, fidelity
誠
makoto truth, reality, fact; sincerity, honesty, faithfulness, good faith; indeed, really, absolutely, truly, actually, very, quite
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