Presume de sabio sin serlo. - Eso es lo que en español se conoce como un "sabiondo".He pretends like he's wise, but he's not. - That's what is known in Spanish as a "sabiondo."
¿Qué opina usted del líder del partido? - Creo que presume de sabio sin serlo.What do you think of the party leader? - I think he brags about a wisdom he lacks.