Ответ:

  1. important — unimportant
  2. hard-working — lazy
  3. silly — sensible
  4. pessimistic — optimistic
  5. unsociable — sociable
  6. sad — happy
  7. well-behaved — badly behaved
  8. patient — impatient
  9. quiet — noisy
  10. untidy — tidy
  11. bad-tempered — good-tempered
  12. unambitious — ambitious
  13. cautious — careless
  14. selfish — unselfish
  15. unimaginative — imaginative
  16. boring — interesting