"不失信用"在英语中可以翻译为 "credible", "repable", "trustworthy" 或 "honorable". 这些词都表示有可信度、可靠性、值得信赖或有诚信的意思。

来源：

"Credible" 源自拉丁语 "credere"，意思是 "相信"。
"Repable" 源自拉丁语 "repare"，意思是 "依靠"。
"Trustworthy" 源自中古英语 "trēowþ"，意思是 "值得信赖的"。
"Honorable" 源自拉丁语 "honorus"，意思是 "尊敬的"。

例句：

"The witness gave a credible testimony." (这名证人的证词可信。)
"The company has a repable reputation for depvering on time." (这家公司有履行承诺的可靠声誉。)
"I trust that you are a trustworthy person." (我相信你是一个值得信赖的人。)
"His honorable actions earned him the respect of his peers." (他的荣誉行为赢得了他同僚的尊敬。)