The state, quality, or condition of being unnoble

(dated, chiefly pre 1900) Not of noble rank. / Not noble; ignoble; base. / (metallurgy) Of a metal, being at the lower end of the electrochemical series, i.e. oxidising readily.

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

(archaic) In an unnoble manner.

(obsolete) Not ennobled.