Adding the suffix '-ous' to nouns

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Across
  1. 2. Feeling or showing an envious resentment of someone or their achievements, possessions, or perceived advantages.
  2. 4. Very great in amount, scale, or intensity.
  3. 8. Very large in size, quantity, or extent.
  4. 9. A region having many mountains.
  5. 10. Causing great damage.
Down
  1. 1. Of great value; not to be wasted or treated carelessly.
  2. 3. Causing great wonder; extraordinary.
  3. 5. Causing or capable of causing death or illness if taken into the body.
  4. 6. Able or likely to cause harm or injury.
  5. 7. Full of danger or risk.