WordWeb Online

1. Completely lacking nobility in character or 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"
    
2. Not of the nobility
   "of ignoble birth"
   - ungentle, untitled

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

Antonym: noble