#shakiness__shakines__trembling__quiver__quivering__vibration__palpitation  a shaky motion; "the shaking of his fingers as he lit his pipe"
  supertype:  motion  a state of change; "they were in a state of steady motion"
  subtype:  tremolo.shakiness  (music) a tremulous effect produced by rapid repetition of a single tone or rapid alternation of two tones
  subtype:  tremor  shaking or trembling (usually resulting from weakness or stress or disease)
     subtype:  essential_tremor__essentialtremor  tremor of unknown cause (usually of the hands and head) that develops in older people; often mistaken for Parkinsonism but is not life-threatening and can usually be kept under control

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