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Adjective: quavering  kwey-vu-ring
  1. (of the voice) quivering as from weakness or fear
    "the old lady's quavering voice";
    - tremulous
Verb: quaver  kwey-vu(r)
  1. Give off unsteady sounds, alternating in amplitude or frequency
    - waver
    - warble, trill

See also: unsteady

Type of: sing, sound, vocalise [Brit], vocalize, voice

Encyclopedia: Quaver