DictionaryamorphousWithout definite form
adjective

amorphous

uh-MOR-fus/əˈmɔːrfəs/

Lacking a definite shape or clear structure.

The amorphous mass of gel spreads beside a neatly formed cube.

A shapeless mass of soft gray-blue gel sprawls in an irregular puddle, contrasted with a small, precisely formed cube of the same material.
Etymology

“Without form” describes the absence of a definite shape, and also makes sense of a group or idea lacking clear structure. The deeper origin of Greek morphē is uncertain.

In context

TED1:50
at first, it's just an amorphous blob, and then there's a moment where the birds shift, and they form the shape of a starling in the sky!
"A Bird Made of Birds" | Sarah Kay

More examples

  • The proposal remains an amorphous collection of ideas.
  • The artist molds the clay into an amorphous mass.
  • Glass has an amorphous structure rather than a regular crystal lattice.

Similar words

shapeless
The ordinary physical description of lacking a definite outline.
unstructured
Emphasizes absence of organization rather than visible shape.