/ tjuːˈmʌltʃuəs; NAmE tuː-/ adjective [ usually before noun ]
1.
very loud; involving strong feelings, especially feelings of approval :
tumultuous applause
a tumultuous reception / welcome
2.
involving a lot of change and confusion and/or violence
SYN tempestuous :
the tumultuous years of the English Civil War
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WORD ORIGIN
mid 16th cent.: from Old French tumultuous or Latin tumultuosus , from tumultus .