Most maintained means that something is well-taken care of or well-preserved. Antonyms for this term could be poorly maintained, neglected, dilapidated, or run-down. When something is poorly maintained, it means that it is not taken care of properly or has been neglected over time. Neglected refers to something that has not been given attention or care. Dilapidated means that something is in disrepair and has deteriorated over time. A run-down item is in a state of disrepair and is often considered to be in poor condition. In contrast, the antonyms of most maintained describe items that are not well-preserved or taken care of.