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