descartar
transitive verb
1 (eliminar) [+candidato, plan, opción] to reject; rule out [+posibilidad, hipótesis] to dismiss; discount
no hay que descartar la existencia de agua en el planeta we cannot dismiss o discount the possibility of water on the planet; han descartado la convocatoria de elecciones anticipadas they've ruled out (the possibility of) an early election; ya puedes descartar lo de hacer una fiesta en casa you can forget about having a party at home