-less means "no", in this case.
So, priceless means no price.
This is similar to meaningless or senseless, although fruitless doesn't necessarily mean "no fruit"!
The Latin word for "priceless" is inaestimabilis.
That vase is priceless. The experiences I had in your country have been priceless.
There is no specific word for priceless, but "no price" is haud pretium.
The look on her face was priceless.
The world 'priceless' in Spanish is ' inapreciable.
The expression on his face when he received the good news was priceless.
luciousdeliciousviciousambitiouscapriciousjudicious
priceless
The mother's smile is priceless.This car is priceless for him, it reminds him of a lot of great memories.
The gams on that dame are priceless.
The look of bewilderment on his face was priceless!
priceless, precious, treasure