perseverative

/pərˈsɛvəˌreɪtɪv/
adjective
  1. Tending to repeat the same action, word, or thought over and over, especially when it is no longer needed.
    • In the test, the subject showed perseverative responses even after the correct answer changed.
    • The child's perseverative drawing of the same shape worried his parents.
    • His perseverative behavior made it hard for him to switch to a new topic in conversation.