collapsitarian adjective 2noun 1forms 3 adjective2 •Desiring social or economic collapse.The Dark Mountain project offends a lot of people. It gets called defeatist, misanthropic, “collapsitarian.” But surely there is something in the air (and in the soil, and the ocean) these days. — 2014 •Of or pertaining to collapsitarianism. noun1 •A person who desires or predicts a social or economic collapse.According to several self-styled collapsitarians, the world now faces a century of declines, the long emergency, environmental collapse, or peak everything. — 2014 formscollapsitarians · more collapsitarian · most collapsitarian