Etymology
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vacuous (adj.)

1640s, "empty" (implied in vacuousness), from Latin vacuus "empty, void, free" (from PIE *wak-, extended form of root *eue- "to leave, abandon, give out"). Figurative sense of "empty of ideas, without intelligent expression" is from 1848. Related: Vacuously.

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Definitions of vacuous

vacuous (adj.)
devoid of intelligence or thought;
a vacuous mind
Synonyms: mindless
vacuous (adj.)
devoid of significance or force;
vacuous comments
Synonyms: empty / hollow
vacuous (adj.)
devoid of matter;
a vacuous space
From wordnet.princeton.edu