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Adjective: desultory  'de-sul,to-ree [N. Amer], 'de-sul-t(u-)ree or 'de-sul-t(u-)ree [Brit]
  1. Lacking a clear plan, purpose, or regular order; randomly jumping from one thing to another
    "His desultory reading habits meant he never finished a book"

See also: purposeless

Encyclopedia: Desultory