robustious
1. [ adjective ] noisy and lacking in restraint or discipline
Synonyms: boisterous unruly rumbustious rambunctious
Examples:

"a boisterous crowd" "a social gathering that became rambunctious and out of hand" "a robustious group of teenagers" "an unruly class"

Related terms: disorderly
Similar spelling:   robustness
  robustly