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Related to solid: States of matter
solid(Compact), adjective bunched, close, compressed, concentrated, condensed, congealed, consolidated, dense, firm, grumose, hard, hardened, impermeable, incompressible, indiscerptible, indivisible, inflexible, insecable, inseparable, massed, massive, monolithical, nonporous, ossified, packed, packed tooether, pressed together, rigid, serried, solidified, stiff, thick, tight, undissolved, united, unyielding
solid(Sound), adjective able to pay, assured, convincing, dependable, durable, enduring, faithworthy, fast, firm, firmus, guaranteed, incontrovertible, irrefutable, judicious, just, lasting, logical, politic, precautional, precautionary, precautious, prudent, prudential, rational, reasonable, reliable, rugged, safe, sagacious, sage, sapient, secure, sensible, solidus, solvent, stabilis, stable, stanch, steadfast, steady, strong, sturdy, substantial, substantive, true, trustworthy, trusty, unconfutable, unerring, unfailing, unimpeachable, unquestionable, unrefutable, valid, weighty, well-built, well-constructed, well-established, well-founded, well-made, wise
See also: authentic, axiomatic, bodily, cogent, cohesive, compact, compound, concrete, corporeal, dependable, firm, fixed, indomitable, inflexible, infrangible, intact, material, meritorious, ossified, physical, secure, sound, stable, staunch, strong, substantive, tangible, unyielding, valid, well-grounded, whole