• Romanian: soliditate

Synonyms

• compactness
• consistency
• density
• fullness
• hardness
• massiveness
• soundness
• strength

Antonyms

• fluidity
• hollowness
• instability
• openness
• weakness

Solid most commonly refers to a phase (or state) of matter.

Solid may also refer to:

• Solid geometry, the traditional name for the geometry of three-dimensional Euclidean space
  • Polyhedron, a geometric object with flat faces and straight edges
• A material with high stiffness or strength, informally
• A material (especially a metal) of which an object is solely made throughout (without joins or holes), e.g.: solid wood
• An object without holes (cf. hollow)
• Solid (KDE), the device framework of KDE 4
• Solid (솔리드), a 90's Korean R&B group
• "Solid (song)", 1984 Ashford & Simpson song
• Solid (album), U.D.O.'s fifth album
• An abbreviation for five basic class design principles in Object-Oriented-Design: Single responsibility principle, Open/closed principle, Liskov substitution principle, Interface segregation principle, Dependency inversion principle
• Solid (billiard ball), the wholly colored balls 1-7
• Solid Snake
• Solid Database
• Do a Solid - To do the right thing, or do a favor.
• Solids - the food babies move to after being breastfed
• Regular human beings or organisms of a 'solid' disposition that the Changeling/Founders call them.

abidingness, aplomb, authenticity, authoritativeness, authority, balance, balanced personality, body, calculability, callosity, callousness, changelessness, closeness, cogency, combination, compactness, completeness, comprehensiveness, concreteness, congestedness, congestion, consistence, consistency, constancy, cool, credit standing, crowdedness, denseness, density, dependability, durability, durableness, duration, durity, endurance, entireness, entirety, equilibrium, exhaustiveness, faithworthiness, fastness, firmness, fixedness, flintiness, force, frozenness, fusion, gluiness, hardening, hardness, hardness of heart, homeostasis, identity, immobility, immobilization, immovability, immovableness, immutability, impenetrability, impermeability, imperturbability, imporosity, inclusiveness, incompressibility, individuality, indivisibility, induration, inertia, inextricability, inflexibility, intactness, integrality, integration, integrity, invariability, invariableness, inveteracy, invincibility, inviolability, irreducibility, irremovability, jammedness, justness, lastingness, long standing, mass, materiality, nerve, obduracy, omnipresence, oneness, organic unity, palpability, particularity, permanence, permanency, perpetualness, persistence, persistency, pervasiveness, ponderability, predictability, purity, quiescence, relative density, reliability, resistance, restiveness, rigidity, rootedness, sang-froid, secureness, security, selfsameness, simplicity, singleness, singularity, solidarity, solidification, solidness, solvency, soundness, specific gravity, spissitude, stability, stable equilibrium, stable state, standing, stasis, staunchness, steadfastness, steadiness, steady nerves, steady state, steeliness, stoniness, stoutness, strength, sturdiness, substance, substantiality, substantialness, tangibility, temper, thickness, thoroughness, torpor, totality, toughness, trustworthiness, ubiquity, unchangeability, unchangingness, undeflectability, undividedness, unerringness, unification, uniformity, unindebtedness, uniqueness, unity, universality, univocity, unmovability, unshakable nerves, unshakableness, unyieldingness, validity, vis inertiae, viscidity, viscosity, viscousness, weight, wholeness