One who puts on a mask and feigns himself to be what he is not; a dissembler in religion. Our Lord severely rebuked the scribes and Pharisees for their hypocrisy (Matthew 6:2, 5, 16). "The hypocrite's hope shall perish" (Job 8:13). The Hebrew word here rendered "hypocrite" rather means the "godless" or "profane," as it is rendered in Jeremiah 23:11, i.e., polluted with crimes.

Noah Webster's New International Dictionary of the English Language

(n.) One who professes beliefs he is not willing to uphold; one who plays a part; especially, one who, for the purpose of winning approbation of favor, puts on a fair outside seeming; one who feigns to be other and better than he is; a false pretender to virtue or piety; one who simulates virtue or piety.