erratically

/ɪˈrætɪkli/
adverb
  1. In a way that is not regular, consistent, or predictable; with sudden changes in behavior, movement, or quality.
    • The stock market has been moving erratically all month due to uncertain news.
    • The old car's engine ran erratically, sometimes stalling at red lights.
    • She slept erratically during the exam week, waking up at all hours of the night.
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