Final answer:
The term used by the Nazis to label those they considered unworthy of life was 'Untermenschen' or 'subhumans,' leading to the extermination actions like the Einsatzgruppen shootings and the Final Solution.
Step-by-step explanation:
The term used by the Nazis to describe those individuals they deemed unworthy of life and thus worthy of killing was Untermenschen. This term translates to 'subhumans' and was part of the Nazi racial ideology that categorized people into hierarchies, with Aryans at the top as the 'master race' and others, particularly Jews, Slavs, and those with disabilities, at the bottom. The Final Solution, a euphemism for the genocide of Jews, implemented the idea that so-called Untermenschen should be eliminated. The systematic extermination included mass shootings by Einsatzgruppen, gas vans, and ultimately, death camps.