Hi,
-These should be the correct matches:
5. defensible, (-) A, pardonable.
2. lovable, (-) B, difficult to believe.
7. infallible, (-) C, capable of being defended.
8. unstable, (-) D, sure to happen.
3. sensible, (-) E, sound reason; good sense.
4. inevitable, (-) F, not firmly fixed.
1. incredible, (-) G, able to be loved.
6. excusable, (-) H, free from error.
Let me know if my answer is wrong or not what you were looking for so I can help all I can.
If you have any questions about my answer let me know and I may be able to help.
I hope that my answer helped you out. :)