Meanings of vacant astonishment in inglês

But the vacant astonishment of Robert Sadler's face gave true answer.

MARSHAL (who all this while has been gazing in vacant astonishment at the letter).

They came within about a stone's cast of her, and then stopped, gazing at the English with a look of vacant astonishment.

Carrio stared in vacant astonishment on his master's disordered countenance; and, forgetting his bundle of dogskins, suffered them to drop unheeded on the floor.