unsparing
adjective uk/ʌnˈspeə.rɪŋ/ us/ʌnˈsper.ɪŋ/
(HIDING NOTHING)
无情的;不避讳的，不隐藏的
showing no kindness and no wish to hide the unpleasant truth
The documentary went through all the graphic details of the operation in unsparing detail. 该纪录片记录下了手术过程中所有翔实的细节，未经删节。
(GENEROUS)
formal极其大方的，慷慨的
extremely generous with money, time, help, etc.
Last of all, our thanks go to the caterers who have been unsparing in their efforts to make this afternoon such a success. 最后，我们要感谢各位酒宴承办人员，他们不辞辛劳的服务使今天下午的活动大获成功。