Undone
Part of speech: verb
Definition: To reverse the effects of an action.
Example sentence: Nothing has been left undone by the enemies of freedom. Every art and artifice, every cruelty and outrage has been practiced and perpetrated to destroy the rights of man. In this great struggle, every crime has been rewarded and every virtue has been punished.
Unfinished
Part of speech: adjective
Definition: not finished, not completed
Example sentence: I don't like to leave anything unfinished. I have an absolute need to see that every phone call is returned, every letter answered.