solid
sol-id
noun
A three-dimensional object or substance that is not liquid or gas.
"Cubes and spheres are examples of solids."
adjective
Having a firm shape, not liquid or gas; dense throughout.
"The concrete wall felt incredibly solid."
adjective
Reliable, strong, and dependable; not easily broken or failing.
"He has a solid reputation in the community."
Thesaurus
Synonyms: serious, hard, firm, homogenous, self-colored, self-coloured, homogeneous, substantial, satisfying, square, hearty, wholesome