The word "renegue" refers to someone who breaks a promise or fails to live up to an agreement. There are several synonyms that can be used in place of "renegue" to convey a similar meaning. One such word is "backslider," which refers to someone who regresses or falls back into old habits or behaviors. Another synonym is "defector," which is someone who abandons a cause or a group they were previously loyal to. "Turncoat" is yet another option that refers to someone who changes their allegiance or beliefs quickly and often betraying their former allies. All of these synonyms for "renegue" can help to convey a sense of disappointment or betrayal.