shamefaced, -fast. It is true that the second is the original form, that -faced is due to a mistake, & that the notion attached to the word is necessarily affected in some slight degree by the change. But those who, in the flush of this discovery, would revert to -fast in ordinary use are rightly rewarded with the name of pedants .... [Fowler]
拼写受 face 影响，俗化自 shamefast,来自 shame,羞耻，羞愧，-fast,固定的，稳固的。
该词的英语词源请访问找单词词源英文版：shamefaced 词源，shamefaced 含义。