Solid

jednolity

(of one color)

masywny

(large, massive)

rzetelny

(lacking errors or inconsistencies)

solidny

(strong, unyielding (as of foundations etc))

stały

(in the solid state)

sycący

(extremely filling)

łączny

(typography: written as one word)

bryła

(geometry: three-dimensional object)

ciało stałe

(chemistry: fundamental state of matter)