Messaging Mania, Prefixes re-, un-, pre-, mis-

1. misfile
2. unwanted
3. recycle
4. undone
5. presale
6. misread
7. recall
8. precut
9. unload
10. misnumber
11. unfair
12. mistreat
13. unhappy
14. retold
15. preplan
16. hard
17. porch
18. carve
19. prejudge
20. uncertain