fitful

Adjective
  1. Occurring in spells and often abruptly (synset 300596301)
    "fitful bursts of energy"; "spasmodic rifle fire"
    similar to: sporadic - recurring in scattered and irregular or unpredictable instances
    same as: spasmodic
  2. Intermittently stopping and starting (synset 300291459)
    "fitful (or interrupted) sleep"; "off-and-on static"
    similar to: broken - not continuous in space, time, or sequence or varying abruptly
    same as: interrupted, off-and-on

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