Boost your vocabulary 'austere, insidious and conspiratorial'

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Across
  1. 4. very simple / very strict
  2. 6. kept a secret, clandestine
  3. 8. hidden and private
  4. 13. sly, devious
  5. 15. causing harm gradually
  6. 18. secret plan/ sharing a secret
Down
  1. 1. eating/drinking a moderate amount
  2. 2. intense
  3. 3. kept under control
  4. 5. simple
  5. 7. no luxury
  6. 9. a general agreement
  7. 10. dishonest
  8. 11. agreement or harmony
  9. 12. misleading
  10. 14. behaving according to rules/laws
  11. 16. furtive, secretive, sneaking
  12. 17. careful with money