General antonyms:
* Orderly
* Well-behaved
* Disciplined
* Submissive
* Manageable
* Controlled
* Docile
* Compliant
* Obedient
* Tame
Antonyms specifically related to hair:
* Straight
* Sleek
* Smooth
* Tame
* Manageable
Antonyms specifically related to behavior:
* Well-mannered
* Polite
* Respectful
* Cooperative
* Easygoing
The best antonym will depend on the specific context in which you are using the word "unruly."