invaluable /in-valˈū(-ə)-bl/

1. That cannot have a value set upon it
2. Priceless

invalˈuableness noun

• retrospected
• retrospecting
• retrospection
• retrospections
• retrospective
• retrospectively
• retrospectives
• retrospects
• retrotransposon
• retroussage
• retroussages
• retroussé
• retroversion
• retroversions
• retrovert
• retroverted
• retroverting
• retroverts
• Retrovir
• retroviral
• retrovirus
• retroviruses
• retry
• retrying
• rets