Suffix -ous

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Across
  1. 3. Willing to take risks in order to find excitement
  2. 4. Silly, foolish, laughable
  3. 7. Having many mountains
  4. 8. Filled with or containing poison
Down
  1. 1. Likely to cause harm; not safe
  2. 2. Brave
  3. 5. Shocking in behaviour, appearance or speech
  4. 6. Full of happiness