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• s  noisy and lacking in restraint or discipline
  a robustious group of teenagers

• The robustious Canadian dollar was a symbol of Canada's growing strength, and the diploma for her industrial coming-of-age.
• Cheerful, robustious James Henry ("Jim") Thomas whose smoking-car stories seem to help his popularity as Secretary of State for the Dominions, last week portentously.
• Yale's robustious, tweedy Professor Yandell Henderson last week recapitulated his researches on lungs.

• boisterous
• rambunctious
• rumbustious
• unruly