vacuous

(s) devoid of intelligence asinine, fatuous, inane, mindless,
(s) devoid of significance or point
- empty promises
- a hollow victory
- vacuous comments
empty, hollow,
(s) devoid of matter
- a vacuous space
(s) void of expression
- a blank stare
blank,

asinine fatuous inane mindless empty hollow blank

vacuole

vacuously vacuousness