undone
adjective
1 some improvement work was to be left undone due to the cost:
unfinished, incomplete, half-done;
not started, not done, unaccomplished, unperformed, unexecuted, unfulfilled, unconcluded, unattended to, omitted, neglected, passed over, disregarded, ignored, left, remaining, outstanding, deferred, pending, on ice, awaiting attention, (up) in the air;
informal on the back burner.
▷antonyms finished, complete.