Synonyms for Ignoble (same or very similar meaning)
WordNet sense 1 (not of the nobility):
ungentle, untitledWordNet sense 2 (of humble birth or origins):
lowbornWordNet sense 3 (morally unacceptable):
dishonorableWordNet sense 4 (having or showing an ignoble lack of honor or morality):
base, meanFrom the ODE community, based on WordNetadd/edit