mispronouncedadj.

1844 Edinb. Rev. Oct. 586 A noisy, purseproud, illiterate demagogue, whose Cockney English and scraps of mispronounced Latin were the jest of the newspapers.

1938 Public Opinion Q. 2 191 The faulty English, the foreign accent, the mispronounced words are aids in helping him win and hold attention and sympathy.

1994 Slavic Rev. 53 1067 [He] requested that his insulting and frequently mispronounced name be replaced by the properly Georgian Berzenishvili.