What is the meaning of unruly?

adjective

• Noisy and lacking in restraint or discipline.
  • usage: "a boisterous crowd"; "a social gathering that became rambunctious and out of hand"; "a robustious group of teenagers"; "beneath the rumbustious surface of his paintings is sympathy for the vulnerability of ordinary human beings"; "an unruly class"
  • synonyms: boisterous, rambunctious, robustious, rumbustious
• Unwilling to submit to authority.
  • usage: "unruly teenagers"
  • synonyms: disobedient
• Of persons.
  • usage: "the little boy's parents think he is spirited, but his teacher finds him unruly"
  • synonyms: indocile, uncontrollable, ungovernable