Tumultuous rhymes with:
contemptuous, tempestuous, virtuous, ambiguous, arduous, conspicuous, contemptuous, contiguous, continuous, deciduous, disingenuous, incongruous, ingenuous, innocuous, strenuous, tempestuous, vacuous, virtuous
contemptuous, tempestuous, virtuous, ambiguous, arduous, conspicuous, contemptuous, contiguous, continuous, deciduous, disingenuous, incongruous, ingenuous, innocuous, strenuous, tempestuous, vacuous, virtuous