erratic - definition and synonyms

adjective 

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/ɪˈrætɪk/
  1. changing often or not following a regular pattern, so that it is difficult to know what will happen next

    He’s a good footballer, but a bit erratic.

    the recent erratic performance of the markets

derived word

erratically

 

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/ɪˈrætɪkli/
adverb