desnacer

An obsolete-outside-literature verb meaning, in effect, to un-be-born or to negate one's own existence retroactively — a philosophical paradox verb that surfaces mainly in poetry and essayistic writing about identity and existence, not in everyday Spanish.

• El poema juega con la idea imposible de desnacer. — The poem plays with the impossible idea of un-being-born.
• Sintió el deseo absurdo de desnacer y desaparecer del todo. — He felt the absurd wish to un-be-born and vanish entirely.
• El ensayo explora qué significaría desnacer filosóficamente. — The essay explores what it would mean, philosophically, to un-be-born.

There's no practical mistake to flag for everyday learners — this word belongs to literary and philosophical Spanish, not conversation, so it's worth recognizing on the page rather than trying to use it.

• book Desnacer — A poetic/philosophical work by Spanish philosopher and poet Agustín García Calvo, published by Visor Libros, built around this existential idea of negating one's own birth.