Adjective Puzzle

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Across
  1. 3. Making little or no noise (5 letters)
  2. 4. Lacking in seriousness or common sense (5 letters)
  3. 6. Of or at a low or relatively low temperature (4 letters)
  4. 7. Giving out or reflecting much light; shining (6 letters)
Down
  1. 1. Having a friendly, generous, and considerate nature (4 letters)
  2. 2. Having great physical power and ability (6 letters)
  3. 4. Of small length or duration (5 letters)
  4. 5. Unwilling to work or use energy (4 letters)
  5. 7. Showing courage in the face of fear (5 letters)
  6. 8. Feeling or showing pleasure or contentment (5 letters)