1. solid, solidness, solid state, state of matter, state
usage: 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
2. solidity, solidness, consistency, consistence, eubstance, body
usage: the quality of being solid and reliable financially or factually or morally; "the solidity of the evidence worked in his favor"; "the solidness of her faith gave her enduring hope"