4. my dear time's waste: the waste of my precious time (in sighing for things he wanted but couldn't get).

6. dateless: endless.

7. cancell'd: —When a bill is paid in full it is "cancell'd"; the speaker is saying that he has already paid his debt of tears to lost love.

8. expense: loss.

9. foregone: past.

10. heavily: sadly. tell: count.