apt to quaver; shaky, trembling.
in spasmodic dysphonia, people may not be able to speak or their voice may sound strained, quavery, hoarse, whispery, jerky, creaky, staccato, or garbled and be difficult to understand. doctors do not know what causes spasmodic dysphonia, which is most common between ages 30 and 50 years and is more common in women. doctors think it may be a form of dystonia, a type of movement disorder involving involuntary contraction of various muscles in the body. merckmanuals.com