amorphous

Short definition from Wiktionary

Adjective

1. 1
   Lacking a definite form or clear shape.
2. 2
   Being without definite character or nature.
3. 3
   Lacking organization or unity.
4. 4
   In the non-crystalline solid state of, or being a non-crystalline counterpart to, a crystalline solid.
5. 5
   Infinite and not the disjoint union of two infinite subsets.