(n.) The act of nasalizing, or the state of being nasalized.

aphonia artificial voice broken speech broken tones broken voice childish treble choked voice cracked voice croak crow dysarthria dyslalia dyslogia dysphasia dysphonia dysphrasia falsetto harshness hawking voice hiss hoarseness idioglossia idiolalia impairment of speech lisp lisping loss of voice muzzy speech nasal tone quaver shake sibilation speech defect speech impediment tremor twang