The word "most solidified" means to become stable or set firmly in place. Some antonyms, or opposite words, for "most solidified" include "unsettled," "loose," "fluid," "inconsistent," and "weak." Something that is unsettled is not yet fixed or established. Loose items are not secure and lack structure, while something that is fluid is constantly changing or moving. Inconsistent means something is not steady or dependable. And finally, something that is weak is fragile, and may not hold together as stably as something that is considered "most solidified.