Used to describe something that has a sharp point or edge.
El cuchillo acertero cortó a través de la carne con una facilidad sorprendente, dejando a todos boquiabiertos.
The sharp knife cut through the meat with surprising ease, leaving everyone astonished.
El cuchillo era acertero, capaz de cortar a través de la tela con facilidad.
The knife was sharp, capable of cutting through the fabric with ease.