indefinable /in-di-fīˈnə-bl/

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

• Tom Thumb
• Tom Tiddler's ground
• tomtit
• tomtits
• tom-tom
• tom-tommed
• tom-tomming
• tom-toms
• Tom-trot
• -tomy
• to my mind
• ton
• tonal
• tonalite
• tonalites
• tonalitic
• tonalities
• tonalitive
• tonality
• tonally
• to-name
• to-names
• tonant
• tondi
• tondini