mispronouncing

from The Collaborative International Dictionary of English v.0.48

Mispronounce \Mis`pro*nounce"\, v. t. & i. [imp. & p. p.
   {Mispronounced}; p. pr. & vb. n. {Mispronouncing}.]
   To pronounce incorrectly.
   [1913 Webster]