1. clever – stupid

2. good – wicked

3. full – empty

4. incomplete – full

5. open – obscure

6. simple – compound

7. skilful – awkward

8. complex – elementary

9. handsome – homely

10. merry – tedious

11. funny – deplorable

12. cloudy – serene

13. hostile - good-natured

14. awful – splendid

15. spiteful – friendly

16. obligatory – optional

17. chromatic – monochrome

18. black-and-white – variegated

19. honest – unfair

20. loyal – false

21. correct – wrong

22. deceitful – regular

23. slim – dissonant

24. obstinate – compliant

25. persistent – temporary

26. urgent – retarded

27. permanent – ephemeral

28. convex – concave

29. unsteady – standing

30. lean – impressive

31. scant – magnificent

32. wealthy – meagre

33. robust – diseased

34. sick – salubrious

35. attractive – repulsive

36. repellent – alluring

37. sleek – rough

38. tender – rigid

39. mighty – slight

40. concluding - incipient