"Mourning" is a word used to describe the intense sadness, feeling of loss, or strong emotion someone experiences when they grieve or miss someone or something that has died or is no longer there. Full definition
Yet, I couldn't shake a feeling of mourning of all that I had imagined that hadn't been. (pink-apron.com)
The entire games industry was in mourning in July of last year when it was announced that then President and CEO of Nintendo, Satoru Iwata had passed away after complications due to a tumor at the age of 55. (screenrant.com)
With your day of mourning for not getting the job done, everybody could declare it night. (religion.blogs.cnn.com)