IPA: /tɔːˈtʃʊrəsli/
KK: /tɔrˈtʃʊrəsli/
In a way that causes great pain or suffering, often in a prolonged manner.
The movie was torturously long, making it hard to stay focused.
Torturously → It is formed from "torture" (from Latin *tortura*, meaning a twisting or torment) and the suffix "-ously" (meaning in a manner characterized by). The word "torturously" means in a manner that involves great pain or suffering, akin to the act of torture.
Think of the word 'torture' which means to twist or torment, and remember that 'torturously' describes something done in a painful or tormenting way.