not developed to full potential, as resources or the mind.

not showing improvement, as one's health, appearance, etc.

(of land) not fitted for a profitable use, as by clearing, cultivation, addition of facilities for dwelling or business purposes, or the like.

not used to advantage; neglected

an unimproved opportunity.

(of animal or plant species) not made more useful or attractive by selective breeding or cultivation.

not enhanced; not increased

Our chance of success is unimproved.