Thesaurus

acceptable, adamantine, al dente, alimental, alimentary, angelic, angelical, bang-up, beatific, best, better, blockish, blocky, box-shaped, boxlike, boxy, brick-shaped, bully, cloudy, coagulated, concrete, congealed, consistent, continuous, corking, corneous, cracking, cube-shaped, cubelike, cubic, cubical, cubiform, cuboid, cuboidal, dandy, dependable, dry, earnest, erect, favorable, favourable, firm, fit, fogged, foggy, frosted, general, glaucous, good, good enough, good for you, goodish, goody-goody, granitelike, granitic, grave, great, groovy, hard, hardened, healthful, healthy, heart-healthy, hearty, homogeneous, homogenised, homogenized, homogenous, hornlike, horny, hot, isometric, jelled, jellied, keen, light-tight, lightproof, lignified, massive, milklike, milky, mirky, monolithic, moral, muddy, murky, neat, nifty, not bad, nourishing, nutrient, nutritious, nutritive, obedient, opaque, organic, ossified, overserious, peachy, petrified, petrous, polyhedral, real, redeeming, redemptive, respectable, right, righteous, rocklike, safe, sainted, saintlike, saintly, salubrious, same, satisfactory, satisfying, saving, secure, sedate, self-colored, self-coloured, semihard, semiopaque, semisolid, serious, serious-minded, set, sincere, slap-up, smashing, sober, sobering, solemn, solid, solid-state, solidified, sound, square, stable, steely, stonelike, stony, strong, substantial, superb, swell, thoughtful, three-dimensional, toroidal, tumid, turbid, unanimous, unbroken, unclear, undamaged, undistributed, undiversified, uniform, uninjured, uninterrupted, unvarying, unyielding, upstanding, virtuous, vitreous, well behaved, well-behaved, white, whitish, whole, wholesome, woody, worthy

solid is a ADJ.

solid, solid state, solidness

solid is a NOUN.