weakness of voice
Difficult or abnormal voice production, the enunciation being too high, too loud, or too hard. ... Synonym: functional vocal fatigue. ... Origin: phon-+ G. Astheneia, weakness ... (05 Mar 2000) ... 
(fo″nәs-the´ne-ә) weakness of the voice or difficulty speaking owing to fatigue; called also vocal fatigue.
Type: Term Pronunciation: fōn′as-thē′nē-ă Definitions: 1. Weak voice production, which may be due to fatigue. Synonyms: functional vocal fatigue
phonasthenia 1. Difficult or abnormal voice production, the enunciation being too high, too loud, or too hard.2. Weakness or hoarseness of the voice; especially, that which results from bodily exhaustion.