indefinable /in-di-fīˈnə-bl/

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

indefinˈableness noun

• spondyloses
• spondylosis
• spondylosyndesis
• spondylous
• spondyls
• sponge
• spongeable
• spongebag
• spongebags
• sponge bath
• sponge baths
• sponge cake
• sponge cakes
• sponge cloth
• sponge cloths
• sponged
• sponge down
• sponge-down
• sponge finger
• sponge fingers
• sponge fisher
• sponge fishers
• sponge fishing
• spongeous
• sponger