adjective
amorphous
uh-MOR-fus/əˈmɔːrfəs/
Lacking a definite shape or clear structure.
The amorphous mass of gel spreads beside a neatly formed cube.

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
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!
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.