Weak voice production, which may be due to fatigue. SYN: functional vocal fatigue. [phon- + G. astheneia, weakness]
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phon·as·the·nia .fō-nəs-'thē-nē-ə n weakness or hoarseness of voice
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n.
weakness of the voice, especially when due to fatigue.
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phon·as·the·nia (fo″nəs-theґne-ə) [phon- + asthenia] weakness of voice or difficult phonation from overuse, debilitation, or old age. Called also myasthenia laryngis and vocal fatigue.Medical dictionary. 2011.