vacuous

devoid of significance or point

Empty; unfilled; void; vacant.

Latin vacuus, empty

“If we had your set of musicians and talkers!' Nataly smiled in vacuous kindness, at a loss for the retort of a compliment to a person she measured.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

“She describes the "vacuous impassivity" of the ultrasound technician who gives her the first glimpse of her new baby.”