If price and worth mean the same thing, then why is priceless and worthless opposite?

the reason is becaus if something is priceless to you it means no amount of money will ever be enough for you to give said item away if something is worthless you care nothing about it so if someone gave you a penny for it you would see it as a fair or overpriced trade

Answer:Price is cost and worth is value, so priceless would imply that there is no cost that can be applied, while worthless implies no value.

Explanation: there you go