vacuous

Adjective
  1. Devoid of intelligence or thought (synset 302581841)
    "a vacuous mind"; "a vacant expression"
  2. Devoid of significance or force (synset 301501421)
    "empty promises"; "a hollow victory"; "vacuous comments"
  3. Devoid of matter (synset 301091954)
    "a vacuous space"

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