The crossword solution for the term 'was boisterous' is 'roared, ' which is a 6-letter word. Roaring is an expression of loud, deep, and often aggressive vocalization. It is commonly used by animals such as lions, tigers, and bears, but can also be used by humans to express excitement, anger, or joy. Roaring is often associated with boisterous behavior, which is characterized by being loud, lively, and unrestrained.