Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dĕhŏnestāmentum, i, n. [dehonesto], that which disfigures or dishonors; a blemish, deformity, disgrace, dishonor (excepting once in Sallust, only post-Aug. for dedecus, ignominia).