invaluable /in-valˈū(-ə)-bl/

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

invalˈuableness noun

invalˈuably adverb

• back-calculates
• back-calculating
• back-calculation
• backcast
• backcasting
• backcasts
• back catalogue
• back catalogues
• back-chain
• back channel
• back channels
• backchat
• backchats
• backchatted
• backchatting
• back-cloth
• back-cloths
• back-comb
• back-combed
• back-combing
• back-combs
• back-country
• backcourt
• backcourts
• back-crawl