Amorphous (adjective)

1. Having no definite shape or structure; shapeless.
2. Lacking a clear definition or structure; vague or unformed.

Origin:

Late 16th century: from french amorphe or latin amorphus, from greek amorphos "without form", from a- "without" + morphē "shape".

Examples:

1. The blob of dough was amorphous and shapeless.
2. The amorphous cloud floated aimlessly in the sky.
3. His thoughts were amorphous and he couldn't seem to focus on any one idea.
4. The amorphous substance slowly spread out and covered the entire floor.
5. The amorphous organization had no clear leader or structure.