What is the etymology of the word "hypocrite?"?

I see in this the prefix "hypo," meaning under, beneath, less than, denoting a lack or deficiency; but I want to understand the full meaning of the word. The King James Version of the Bible translates a couple of words (one Hebrew, one Greek) as "hypocrite." My Hebrew / Chaldee lexicon shows the meaning as soiled (with sin), impious. According to my Greek lexicon, it means pretender or actor (under an umed character). Please explain the basis of the meaning of this word, if you would. Thanks!