IPA: /ˈpraɪsləs/
KK: /ˈpraɪsləs/
Something that is so valuable that it cannot be measured in money; it is extremely important or special.
The family heirloom was priceless to her, holding memories of generations.
Priceless → It is formed from "price" (from Old French *priz*, meaning value or worth) and "-less" (meaning without). The word "priceless" means without price or value, indicating something so valuable that it cannot be assigned a monetary worth.
Think of something that has so much 'value' ('price') that it is 'without' ('-less') a price tag — that's why we call it priceless.