indefinable /in-di-fīˈnə-bl/

1. That cannot be defined
2. Hard to identify or describe

indefinˈableness noun

• underquotes
• underquoting
• underran
• under-rang
• underrate
• underrated
• underrates
• underrating
• under-report
• under-reported
• under-reporting
• under-reports
• under-representation
• under-represented
• under-ring
• under-ringing
• under-rings
• under-ripe
• under-roof
• under-roofs
• underrun
• under-rung
• underrunning
• underrunnings
• underruns