unfailing
adjective uk/ʌnˈfeɪ.lɪŋ/ us/ʌnˈfeɪ.lɪŋ/
(个人的优良品质)经久不衰的,一贯的
If a positive quality of someone's character is unfailing, it shows itself at all times.
unfailing enthusiasm 一贯的热情
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