Prefixes over-, under-, sub-, inter-

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Across
  1. 2. Beneath one's feet or in the way.
  2. 3. Temperature below zero degrees Celsius.
  3. 6. Title or heading beneath a main heading.
  4. 7. To put under water or immerse.
  5. 11. Responding in an exaggerated manner.
  6. 13. Extremely happy or thrilled.
  7. 15. Watercraft capable of operating underwater.
  8. 17. To stop or hinder the progress of something.
  9. 19. To underestimate or assign too low a value.
  10. 20. Communication device for short-range conversations.
  11. 22. To twist or weave together.
Down
  1. 1. Not given enough food or nourishment.
  2. 4. Tunnel or passage beneath a road or railway.
  3. 5. Temporary period in between two events or situations.
  4. 8. Not fully cooked or prepared.
  5. 9. Part of the mind below awareness level.
  6. 10. Excessively heavy.
  7. 12. Excessive amount or burden.
  8. 14. Actor who learns another's role in a play.
  9. 15. Underground railway system for public transportation.
  10. 16. To stop or seize something in its path.
  11. 18. Break or pause between two acts or events.
  12. 21. Esteemed more than deserved.