unnoble1
/(ˌ)ʌnˈnəʊbl/adjective
1Not of noble birth or rank.
2Of or relating to a person who is not of noble birth or rank. Now rare.
3Of a person (also occasionally of an animal): not noble in disposition; ignoble, base. Also in early use: †considered unworthy of honour or respect; despised, dishonoured (obsolete ).
4Of, relating to, or characteristic of such a person or his or her behaviour.
5Of a thing: undistinguished, unremarkable, common, mean. Now rare.
Origin
Late Middle English; earliest use found in The Wycliffite Bible (early version). From un- + noble, partly after classical Latin ignōbilis ignoble.
unnoble2
/(ˌ)ʌnˈnəʊbl/verb
[with object] To make (a person or thing) no longer noble.
Origin
Late 16th century; earliest use found in John Florio (1553–1625), author and teacher of languages. From un- + noble, originally after Italian dinobilitare.