Not systematic; not founded upon or in accord with a system; not having a defined system or plan; lacking regular order, distribution, or arrangement.
Synonyms See irregular.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. lacking systematic arrangement or method or organization
Word Usage
"DSM 5 literature reviews are remarkably variable in quality; often one sided, incomplete, and unsystematic; and sometimes giving undue weight to unpublished papers or papers authored by DSM 5 work-group members."