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]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "mispronounced":
   blurred, breathy, choked, choking, croaking, drawling, drawly,
   dysphonic, guttural, harsh, hawking, hoarse, inarticulate,
   indistinct, lisping, muzzy, nasal, quavering, shaking, shaky,
   snuffling, stifled, strangled, thick, throaty, tremulous, twangy,
   velar