1）priceless表示非常珍貴，因而難以計算其價值。
如：priceless masterpieces by Canova and Bernini（卡諾瓦和貝爾尼尼的無價傑作）。
2）worthless 表示沒有什麽價值。
如：I'm afraid your shares are now worthless（恐怕妳的股票現在壹文不值了）。
3）英文解釋差別：
Be careful not to confuse the words priceless, invaluable and worthless. Something which is priceless is so precious that it is difficult to give it a value. …priceless masterpieces by Canova and Bernini. Something which is invaluable is very useful indeed. It has a spelling checker, which is invaluable if you are dyslexic. In contrast, something that is worthless is of very little value. I'm afraid your shares are now worthless.