Source : Webster's Revised Unabridged Dictionary (1913)

Ignoble \Ig*no"ble\, v. t.
   To make ignoble. [Obs.] --Bacon.

Ignoble \Ig*no"ble\, a. [L. ignobilis; pref. in- not + nobilis
   noble: cf. F. ignoble. See {In-} not, and {Noble}, a.]
   1. Of low birth or family; not noble; not illustrious;
      plebeian; common; humble.

            I was not ignoble of descent.         --Shak.

            Her royal stock graft with ignoble plants. --Shak.

   2. Not honorable, elevated, or generous; base.

            'T but a base, ignoble mind, That mounts no higher
            than a bird can soar.                 --Shak.

            Far from the madding crowd's ignoble strife. --Gray.

   3. (Zo["o]l.) Not a true or noble falcon; -- said of certain
      hawks, as the goshawk.

   Syn: Degenerate; degraded; mean; base; dishonorable;
        reproachful; disgraceful; shameful; scandalous;
        infamous.

Source : WordNet®

ignoble
     adj 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"- Oliver Wendell Holmes, Jr. [ant: {noble}]
     2: not of the nobility; "of ignoble (or ungentle) birth";
        "untitled civilians" [syn: {ungentle}, {untitled}]