uncomplaining
adjective approving uk/ˌʌn.kəmˈpleɪ.nɪŋ/ us/ˌʌn.kəmˈpleɪ.nɪŋ/
任劳任怨的，毫无怨言的
willing to do boring or difficult work without complaining or becoming angry
The work is boring, but he's always cheerful and uncomplaining. 这项工作很无聊，但他却总是干得很起劲儿，毫无怨言。