Adverb
1. someday
2. one day
4. at a future date
5. sooner or later
6. by and by
7. in due course
8. in the fullness of time
9. in the long run
Adjective
10. former
11. past
12. previous
13. prior
14. foregoing
15. late
16. erstwhile
17. one-time
18. ex-
19. quondam