Mer-ci-less Sin [mur-ci-less sin] noun 1. A sin committed without no apologies or regret. 2. A band that has created an uncompromising sound to remind everyone what metal should be: no holds-barred energy without reservation. Formed in the urban reaches of Phoenix, Merciless Sin rose from the frustration of its members for a band that can bring hard-core music to the masses instead of the slick, studio-produced schlock pumped out by today’s industry.