prefixes-4

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Across
  1. 2. Remaining the same in all situations (7)
  2. 4. To announce something publicly (8)
  3. 6. Able to speak two languages fluently (9)
  4. 7. One-fourth of a circle or a graph (8)
  5. 10. Designed to be used for many things (12)
  6. 11. Light waves that are just below visible red light (8)
  7. 12. An animal that walks on four legs (9)
  8. 15. Failure to work properly (11)
  9. 16. To support or encourage progress (7)
  10. 17. A one-wheeled vehicle (8)
  11. 18. A three-wheeled vehicle (8)
  12. 19. A return attack against an opponent (14)
Down
  1. 1. A two-wheeled vehicle powered by pedals (7)
  2. 3. A three-sided shape (8)
  3. 4. Forward movement or improvement (8)
  4. 5. Having many different colors (13)
  5. 8. All space, time, matter, and energy (8)
  6. 9. Involving many cultures or ethnic groups (14)
  7. 13. To say the opposite of something (10)
  8. 14. To work against something to reduce its effect (10)