Utter hypocrisy means complete dishonesty and insincerity, which is also known as deceitful behavior. Synonyms for this phrase include double-dealing, phony, pretense, dissimulation, insincerity, and falseness. Double-dealing refers to the act of being dishonest or disloyal, while phony means something that is fake or fraudulent. 'Pretense' implies that someone is pretending to be someone they are not. Dissimulation is the act of hiding one's true feelings or intentions. Insincerity refers to a lack of genuine feeling or interest. Lastly, falseness means something that is not genuine or authentic. All these synonyms can be used interchangeably with utter hypocrisy, to describe someone who is dishonest and insincere.