- amorphous, formless, shapeless - having no definite form or distinct shape; "amorphous clouds of insects"; "an aggregate of formless particles"; "a shapeless mass of protoplasm"
Antonym: formed (indirect, via unformed)
- amorphous, unstructured - lacking the system or structure characteristic of living bodies
Antonym: organic (indirect, via inorganic)
- amorphous, uncrystallized, uncrystallised - without real or apparent crystalline form; "an amorphous mineral"; "amorphous structure"
Antonym: crystalline (indirect, via noncrystalline)