Choose the perfect synonym or antonym for the word

Solid

/ˈsɒləd/

Something that is firm and not liquid or gas, retaining a fixed shape.

Synonyms:

'A very solid one, madam,' said Sophia.

And Cowperwood liked this great solid Irishman.

But it was not in Møller that Bohr found solid footing.

Originating in the late Middle English (1450–1500): from the Old French solide, from Latin solidus, meaning firm or undivided.

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