1. in a way that is extremely valuable or precious beyond monetary worth
2. in an extremely amusing or entertaining way
Usage: informal

Examples

• The ancient manuscript was pricelessly preserved in the museum’s vault.
• Her grandmother’s advice was pricelessly wise and heartfelt.
• The comedian delivered his lines pricelessly, leaving the audience in stitches.
• She smiled pricelessly when she saw the surprise party.
• The family heirloom was pricelessly important to their heritage.
• His reaction to the prank was pricelessly funny.