tumultuous (adj) – full of or causing uproar, riot, or disturbance; highly agitated or distraught (also tumultuary)
BREAKDOWN: TUM- (to swell) + -ULT (root extender) + -OUS (full of)
— tumult is the noisy commotion of a crowd or mob; an uproar, uprising, or riot; mental disturbance or agitation
This word is built on the root TUM-, which means to swell or to be proud.
Common TUM- words include tomb and tumor.
More esoteric TUM- words include contumely, tumefacient, and tumulous.