What is the opposite word of chaotic?

The opposite of chaotic depends on the specific context, but here are some possibilities:

General opposites:

* Ordered

* Organized

* Structured

* Harmonious

* Calm

* Peaceful

* Stable

More specific opposites:

* Methodical (if referring to a process)

* Systematic (if referring to a system)

* Predictable (if referring to a situation)

* Controlled (if referring to something that is being managed)

The best opposite word will depend on the specific meaning you want to convey.