ˈmufflednessn. the state or condition of being muffled; indistinctness.
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1851 H. MelvilleMoby-Dick xxi. 111 He breathed with a sort of muffledness.
1993 N.Y. Times (Nexis) 28 Nov. vii. 11/1 This conflict between the impulse to collaborate and the impulse to remain objective accounts for the muffledness of Ms. Baker's style.