Vacuity

vacuity

noun: vacuity

    1.
    lack of thought or intelligence; empty-headedness.
    "he denounced what he considered the frivolity or vacuity of much contemporary painting"
    synonyms: empty-headedness, lack of thought, lack of intelligence, brainlessness, denseness, thickness, vacuousness, vacancy, inaneness, inanity, stupidity
    "the book's principal defect remains the vacuity of its protagonist"