indefinable /in-di-fīˈnə-bl/

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

• collateralizing
• collaterally
• collaterals
• collateral security
• collates
• collating
• collation
• collations
• collative
• collator
• collators
• colleague
• colleagued
• colleagues
• colleagueship
• colleagueships
• colleaguing
• collect
• collectability
• collectable
• collectables
• collectanea
• collected
• collectedly
• collectedness