-less -ful

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Across
  1. 2. — Full of bright hues
  2. 5. — Without pain
  3. 7. — Using resources carelessly
  4. 9. — Not causing harm
  5. 12. — Aware and attentive
  6. 13. — Feeling gratitude
  7. 14. — Full of happiness
  8. 15. — Unable to speak
  9. 17. — Without significance
  10. 19. — Without an end
Down
  1. 1. — Causing damage
  2. 3. — Without purpose
  3. 4. — Without hope
  4. 5. — Having great strength
  5. 6. — Showing elegance
  6. 8. — Often failing to remember
  7. 10. — Perfect, without error
  8. 11. — Lacking teeth
  9. 16. — Without ability to help oneself
  10. 18. — Showing expertise