Etymology
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unsystematic (adj.)

1770, from un- (1) "not" + systematic (adj.).

updated on March 02, 2014

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Definitions of unsystematic from WordNet

unsystematic (adj.)
lacking systematic arrangement or method or organization;
unsystematic and fragmentary records
he works in an unsystematic manner
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.