inexcusably       
adverb uk/ˌɪn.ɪkˈskjuː.zə.bli/ us/ˌɪn.ɪkˈskjuː.zə.bli/
 (行为)不可原谅地,不可宽恕地
in a way that is too bad to be accepted or forgiven
  The project is inexcusably overdue.  该项目已经无可谅解地逾期了。 
 He has an inexcusably cavalier attitude about disability and pension issues. 他对残疾和养老金问题采取了不可原谅的轻率态度。 
 See: inexcusable
 - More examples
 - Inexcusably, we weren't given enough light for reading.
 - His parenting philosophy left his children inexcusably ill-prepared for adulthood.
 - It took almost two years, an inexplicably and inexcusably long time, to complete the update.