Jesus boldly called His critics hypocrites. They professed to honor God with their behavior, but they really did not honor Him in their hearts. What Isaiah said about the hypocrites in his day fit these critics exactly. They stressed precepts to the exclusion of principles. [source][source][source]
"Jesus calls the opponents "hypocrites" (hupokriton), a word in classical Greek that means "to play a part," an "actor." It does not carry the moral overtone of fraud that our English word does today. Rather it refers to the discrepancy in the behavior of one who unconsciously has alienated oneself from God, an "ungodly" person .., by one"s actions ..." [1][source]