unnoble

Etymology

From Middle English unnoble, equivalent to un- + noble.

adj

1. (dated, chiefly pre 1900) Not of noble rank.
   Yet from the commencement of mining there have been unnoble proprietors of mines, who belonged to the class of merchants. 1800, William Took, View of the Russian empire during the reign of Catharine the Second
2. Not noble; ignoble; base.
3. (metallurgy) Of a metal, being at the lower end of the electrochemical series, i.e. oxidising readily.
   unnoble metal

verb

1. (transitive) To make (someone or something) no longer noble