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Adjective: spasmodic  spaz'mó-dik
  1. Affected by involuntary jerky muscular contractions; resembling a spasm
    "his body made a spasmodic jerk";
    - convulsive, spastic
  2. Occurring in spells and often abruptly
    "spasmodic rifle fire";
    - fitful

See also: sporadic, unsteady

Encyclopedia: Spasmodic