The big bang theory

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Across
  1. 4. Person who is critical
  2. 5. Unimportant
  3. 8. Irritation
  4. 11. Ancient Egypt burial building
  5. 14. Not lasting
  6. 15. Adverb for like
  7. 18. Plant
Down
  1. 1. Someone you know
  2. 2. Words of song
  3. 3. undo
  4. 6. Interrupt
  5. 7. Group talking about what to do
  6. 9. Word for 14
  7. 10. Ridicule
  8. 12. You
  9. 13. Belief world created by supreme being
  10. 16. Increase in size
  11. 17. Ask or request