The antonyms for the word "most olid" are rather easy to determine, as solid and its form olid have a term as their root. Therefore antonyms include words like liquid, gaseous, and vaporous. These terms refer to substances that are opposite to solids, being liquid, gas, and vapor, respectively. Other opposite words to 'solidify' may include thaw or liquefy, which imply the transformation of a solid substance into something less dense. On a more figurative level, antonyms for "most olid" might include impermanent, fluid,, and unstable, which all suggest that something is in a state of change instead of being solid and rigid.