WordWeb Online

1. Not of the nobility
   "of ignoble birth";
   - ungentle, untitled
    
2. Completely lacking nobility in character, quality or purpose
   "something cowardly and ignoble in his attitude"; "I think it a less evil that some criminals should escape than that the government should play an ignoble part"

See also: base, contemptible, cowardly, currish, dishonorable [US], dishonourable [Brit, Cdn], fearful, grandeur, lowborn, magnanimousness, mean, meanspirited, nobility, nobleness

Antonym: noble