1. (dated, chiefly pre 1900) Not of noble rank.
    1800, William Took, View of the Russian empire during the reign of Catharine the Second
    Yet from the commencement of mining there have been unnoble proprietors of mines, who belonged to the class of merchants.
  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
Synonyms Verb

unnoble (unnobles, present participle unnobling; past and past participle unnobled)

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

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