1. Word List: il-, im-, in-, ir
= not

2. not following a pattern; not regular

3. irregular
not following a pattern; not regular

4. not of full quality, ability, or strength; damaged

5. impaired
not of full quality, ability, or strength; damaged

6. not in use; idle, not active

7. inactive
not in use; idle, not active

8. not able to change back to a former state; impossible to revert back

9. irreversible
not able to change back to a former state; impossible to revert back

10. unable; not having the ability

11. incapable
unable; not having the ability

12. not within the law; not acceptable

13. illegal
not within the law; not acceptable

14. not able to move; not movable; motionless

15. immobile
not able to move; not movable; motionless

16. to not be able to move forward; to block the passage

17. impede
to not be able to move forward; to block the passage