Something inglorious is shameful or disgraceful. An inglorious end to a politician's career might include evidence that he bought people's votes and lied about his educational background.
You could call World War II a generally inglorious period in Germany's history, or talk about a southern US city with an inglorious record of bias against African Americans. And if your favorite basketball team loses every game, they have an inglorious season. Inglorious adds the "not" prefix in- to glorious, from its Latin root gloriosus, "full of glory" or "famous."