Usage Note
Caótico is used with both ser and estar: ser caótico describes an inherently disorganised entity (a chaotic system), while estar caótico describes something in a chaotic state at a given moment (el tráfico está caótico). The noun is caos (masculine, no plural).
Examples
"El tráfico estaba caótico durante las obras."
Natural Translation
The traffic was chaotic during the roadworks.

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