the quality of being difficult; "they agreed about the difficulty of the climb"
a factor causing trouble in achieving a positive result or tending to produce a negative result; "serious difficulties were encountered in obtaining a pure reagent"
a condition or state of affairs almost beyond one's ability to deal with and requiring great effort to bear or overcome; "grappling with financial difficulties"
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
a substance that is solid at room temperature and pressure
uninterrupted in space; having no gaps or breaks; "a solid line across the page"; "solid sheets of water"
incapable of being seen through; "solid blackness"
having three dimensions; "a solid object"
acting together as a single undiversified whole; "a solid voting bloc"
characterized by good substantial quality; "solid comfort"; "a solid base hit"
of one substance or character throughout; "solid gold"; "carved out of solid rock"
of the same color throughout; "solid color"
of a substantial character and not frivolous or superficial; " work of solid scholarship"; "based on solid facts"
of definite shape and volume; firm; neither liquid nor gaseous; "ice is water in the solid state"
entirely of one substance with no holes inside; "a solid block of wood"
financially sound; "the bank is solid and will survive this attack"
of good quality and condition; solidly built; "a solid foundation"; "several substantial timber buildings"
characterized by care and perseverance in carrying out tasks; "a diligent detective investigates all clues"; "a diligent search of the files"
quietly and steadily persevering especially in detail or exactness; "a diligent (or patient) worker"; "with persevering (or patient) industry she revived the failing business"
a conceptual whole made up of complicated and related parts; "the complex of shopping malls, houses, and roads created a new town"
(psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior
a compound described in terms of the central atom to which other atoms are bound or coordinated
complicated in structure; consisting of interconnected parts; "a complex set of variations based on a simple folk melody"; "a complex mass of diverse laws and customs"