Finding antonyms for the word "most crumbled" can prove to be a bit tricky, as it is a superlative form of the verb crumble. However, some possible antonyms could be "solid," "strong," "firm," or "stable." These words connote a sense of strength and durability, rather than fragility or weakness. For example, a foundation that is "solid" is often considered trustworthy and reliable, whereas a foundation that is "most crumbled" would be cause for concern. In general, antonyms for "most crumbled" would be words that describe structures or objects that are in good condition, rather than those that are falling apart or breaking down.