unbirth noun 2verb 2forms 3 noun2 •The absence of birth; failure to be born.So, you're like somebody grieving over the unbirth of a gnat when there's thousands, getting burned and blasted and... all sorts of things are happening to them... — 1971 •(Internet) A type of vore fantasy in which a living being is drawn back through the vagina into the womb.Me, I like vore and unbirth. But then, I'm strange […] — 2005 verb2 •Hypothetically, to reverse the birth of; to cause never to have been born. •(Internet) To consume something or someone in such a manner formsunbirthed · unbirthing · unbirths