Boy wonder: vocabulary review

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Across
  1. 5. A person who has been trained for travelling in space
  2. 6. Not taking or showing enough care and attention
  3. 8. Worried and anxious
  4. 10. a person who continuously worries about their health without having any reason to do so
  5. 11. Able to express thoughts and feelings easily and clearly, or showing this quality
  6. 14. The process of joining two nuclei to produce energy
  7. 15. Pleased and happy
  8. 16. showing what someone thinks or feels
Down
  1. 1. Only interested in yourself and your own activities
  2. 2. synonym of intelligent
  3. 3. Thinking that you are more important or more intelligent than you really are
  4. 4. Being certain of your abilities or having trust in people, plans, or the future
  5. 7. A test done in order to learn something or to discover if something works or is true
  6. 9. (Of a person) friendly and energetic and finding it easy and enjoyable to be with others
  7. 12. Not willing to consider ideas and opinions that are new or different to your own
  8. 13. Intelligent and quick to learn