indefinable /in-di-fīˈnə-bl/

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

• pin it on
• pin it onto
• pink
• pink-collar
• pinked
• pink elephants
• pinker
• Pinkerton
• Pinkertons
• pinkest
• pink-eye
• pink-eyed
• pink gin
• pink gins
• pinkie
• pinkier
• pinkies
• pinkiest
• pinkiness
• pinkinesses
• pinking
• pinking iron
• pinking irons
• pinkings
• pinking shears