vacuitous

adjective4

1. •
   Lacking substance; trivial; meaningless.
2. •
   Deficient; lacking.

   • The doing of an act which might not lawfully be done, is nugatory, ineffective and vacuitous. — 1972
3. •
   Empty.

   • On the one hand there will be vacuitous chambers and on the other hand too much air. — 1907
4. •
   (no longer used) Lacking thought or intelligence.