Which word describes the quality of being shapeless?

The term that describes the quality of being shapeless is "amorphous." This word originates from the Greek roots meaning "without form" or "lacking a defined shape." It is commonly used in both scientific contexts, such as describing certain physical materials that do not have a clear structure, as well as in more abstract contexts, such as in literature or art, to explain concepts or entities that do not conform to traditional forms or categories.

In contrast, "ambivalent" refers to having mixed feelings or contradictory ideas about something or someone, "anarchy" describes a state of disorder due to the absence or nonrecognition of authority, and "antiquated" means something that is no longer in use or outdated. None of these terms pertain to the notion of being shapeless, making "amorphous" the precise choice for this description.