solid has 13 distinct synonyms spread across 7 of its 18 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 3 recorded opposites are liquid, gaseous, hollow.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
entirely of one substance with no holes inside
“a solid block of wood”
7 of the 18 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for solid.
Synonyms, antonyms and the broader and narrower relations for solid come from Princeton University’s WordNet. Full sources and licences.
the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape
a three-dimensional shape