indefinable /in-di-fīˈnə-bl/

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

• interwork
• interworked
• interworking
• interworks
• interwound
• interwove
• interwreathe
• interwreathed
• interwreathes
• interwreathing
• interwrought
• interzonal
• interzone
• interzones
• intestacies
• intestacy
• intestate
• intestates
• intestinal
• intestinal flora
• intestine
• intestines
• in that
• in that case
• in the abstract