General opposites:
* Desorganizado: This is the most direct opposite, meaning "disorganized."
* Caótico: This means "chaotic" and implies a lack of order and structure.
* Desordenado: This means "disorderly" and emphasizes the lack of neatness.
Context-specific opposites:
* If you're talking about someone's personal habits, you could use "descuidado" (careless) or "despreocupado" (unconcerned).
* If you're talking about a physical space, you could use "desordenado" (disorderly), "sucio" (dirty), or "desastroso" (disastrous).
* If you're talking about a process or system, you could use "ineficaz" (inefficient), "ineficiente" (inefficient), or "incompleto" (incomplete).
The best opposite will depend on the specific context and what you want to emphasize.