1. activation – (deactivation = breaking up a millitary unit by transfers or discharges)

2. advantage – (disadvantage = the quality of having an inferrior or less favourable position)

3. belief – (disbelief = doubt about the trufth of something, a rejection of belief)

4. comfort – (discomfort = the state of being tenze and feeling pain, an uncomfortable feeling in some part of the body)

5. compression – (decompression = relieving presure, restoring compressed information to its normal form for use or display)

6. content – (descontent = a longing for something better than the present situation)

7. favour – (disfavour = the state of being out of favour, a feeling of dislike or disaproval)

8. harmony – (disharmony = a lack of harmony, a disagreement and unpleasentness between people)

9. hydration – (dehydration = drynes resulting from the removal of water)

10. legality – (illegality = the state of being illegal, unlowfulness by virtue of violating some legal statute)

11. legibility – (ilegibility = writing, print or handwriting that cannot be read)

12. legitimacy – (ilegitimacy = the status of being born to parents who were not married)

13. literacy – (illiteracy = an inability to read, ignoranse resulting from not reading)

14. mobility – (imobility = the quality of not moving or not able to move)

15. morality – (immorality = moraly objectionable behaviour)

16. order – (desorder = a disturbance of normal functioning, a condition in which things are not in their expected places)

17. patience – (impatience = a lack of patience; iritation with anything that causes delay)

18. piety – (impiety = a lack of respect, especially for God or relligion)

19. possibility – (impossibility = incapability of existing or occuring, an alternative that is not available)

20. potency – (impotency = the quality of lacking strength or power; being week and feeble, an inability to copulate)