adjective

1. Lacking a definite form or clear shape.

   "The enormous pile of spaghetti landed on the floor in an amorphous heap."

2. (by extension) Being without definite character or nature.

3. (by extension) Lacking organization or unity.

4. In the non-crystalline solid state of a typically crystalline solid.

5. (of a set) Infinite and not the disjoint union of two infinite subsets.