Which word does NOT have a similar meaning to "shapeless"?

The word "shapeless" refers to something that lacks a definite shape or form. Among the choices provided, "apparent," which means something that is clearly visible or understood, does not share this meaning and therefore stands out as different.

On the other hand, "nebulous," "amorphous," and "unstructured" all relate to the concept of lacking a clear or defined shape. "Nebulous" suggests something that is vague or ill-defined; "amorphous" directly means lacking a clear shape or form; and "unstructured" denotes a lack of formal organization or definite shape. Therefore, these three words align closely with the meaning of "shapeless," while "apparent" does not fit into that category, making it the correct choice for this question.