Definition of systemless in US English:

systemless

adjective

  • See system

    • ‘They are are typically systemless scenarios designed for convention play.’
    • ‘I know a large number of people who prefer to game systemless.’
    • ‘If you play this game systemless you've missed the boat.’
    • ‘Sometimes I'm tempted to go with a systemless source book, because everyone likes different types of rules.’
    • ‘Adventure writers that want to go systemless may find it helpful to introduce a little bit of system into their adventures.’

Pronunciation

systemless

/ˈsistəmləs//ˈsɪstəmləs/