ambiguity awe, brevity, carnivore, chronic, concussion, connotation, conspicuous, herbivore, omnivore, ubiquitous, indigenous, sustenance, loathe, milieu, acute, sedentary, momentous, obscure, insightful

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Across
  1. 2. plant-eater
  2. 3. long-term problem
  3. 5. environment, setting and surrounding culture
  4. 7. antonym of active
  5. 8. present everywhere
  6. 10. synonym of wonder
  7. 12. big and obvious
  8. 13. meat-eater
  9. 14. synonym of native
  10. 17. major and big
  11. 19. synonym of brief
Down
  1. 1. heavy blow to the brain causing temporary unconsciousness
  2. 4. synonym of hate
  3. 6. full of insights
  4. 9. synonym of nourishment
  5. 10. fast and immediate
  6. 11. underlying meaning
  7. 15. open to more than one explanation
  8. 16. antonym of blocked
  9. 18. plant and meat eater