without a clear shape or form
amorphous - vague
‘Amorphous’ can be used in a literal sense to describe something lacking a well-defined outline or structure, or in a figurative sense to express something that lacks focus or organization. It is a formal word that is more commonly encountered in text or writing than in everyday conversation.
The amorphous nature of the threat makes it hard to categorize or defend against.
There was no clear shape to the dense clouds over the city. They were quite amorphous.
The colourful amorphism of the design really helps the product to stand out.