From Pluralpedia, the collaborative plurality dictionary
Applies tosystems, headmates, headspaces, system functions
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Pessimibased, also known as Negatibased, refers to a system based in pessimism and/or negativity. This means that pessimism and/or negativity heavily affects, or has affected the system, system structure, innerworld, headmates, etc. but did not cause the system to form and is not an origin.