An ancient Greek artifact that can never be replaced and is considered so valuable no amount of money could ever be used to buy it from the museum where it is located is an example of something that is priceless.
The love of a great spouse is an example of something that is priceless.
A person for whom you feel great affection and who you find charming and amusing is an example of someone who you would describe as priceless.
A priceless remark.
Origin of priceless
- price +"Ž -less