formless

Something formless either has no definite shape, like fog or smoke, or lacks structure, like a formless movie that doesn't seem to have much of a plot.

You can use this adjective to describe things that are physically vague and shapeless, from formless crowds of people surging forward at a rock concert or the formless, ghost-like shapes in your dark basement. It's also good for things like songs, poems, ideas, or concepts that are unstructured or incoherent and hard to make sense of.

Definitions of formless
1

adj having no physical form

“belief in a world filled with... formless but often malevolent beings”
Synonyms:
unbodied
having no body

adj having no definite form or distinct shape

“an aggregate of formless particles”
Synonyms:
amorphous, shapeless
unformed
not having form or shape

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