Wiktionary
unbirth
n. 1 The absence of birth; failure to be born. 2 A paraphilia in which the individual desires to be drawn back through the vagina into the womb.
Usage examples of "unbirth".
But it died away, and she found herself in a gloomy hollow, and she began to realize how evil the apprentice's laughter had sounded, as if he laughed at the death of all love, or even its unbirth.