WordWeb Online

1. Noisy and lacking in restraint or discipline
   "an unruly class";
   - boisterous, rambunctious [N. Amer], robustious, rumbustious [Brit]
    
2. Unwilling to submit to authority
   "unruly teenagers";
   - disobedient
    
3. Failing to follow rules or orders
   "the little boy's parents think he is spirited, but his teacher finds him unruly";
   - indocile, uncontrollable, ungovernable

Derived forms: unrulier, unruliest

See also: difficult, disorderly, insubordinate, unmanageable