lacking definite form; having no specific shape; formless

the amorphous clouds.

of no particular kind or character; indeterminate; having no pattern or structure; unorganized

an amorphous style; an amorphous personality.

Petrography, Mineralogy . occurring in a mass, as without stratification or crystalline structure.

Chemistry . not crystalline.

Biology . having structural components that are not clearly differentiated, as the nuclear material in certain bacteria.

adjective

definite , distinct , distinctive , shaped , shapely

adjective

baggy , blobby , characterless , formless , inchoate , indeterminate , irregular , nebulous , nondescript , shapeless , unformed , unshaped , unstructured , vague , undefined