Re-conditioned refers to restoring or improving the condition of an object, particularly a used one. Its antonym, on the other hand, denotes the opposite meaning. Unconditioned implies that the object has not been restored or refurbished in any way. It hasn't undergone any process of reconditioning to take it back to its original state. Other possible antonyms for re-conditioned include worn out, dilapidated, broken down, and decrepit. These terms refer to objects that are in a poor state and in need of repair or replacement. By understanding the antonyms of re-conditioned, we can better appreciate what it means to restore and improve the condition of an object.