The antonyms for the word "in-consequentialities" are significant, important, consequential, material, and weighty. These words carry the opposite meaning of something that is unimportant, trivial, inconsequential, or immaterial. When describing events, decisions, or actions that have a real impact, these antonyms better represent the gravity of the situation. For example, a material decision can have significant consequences on a person's future, whereas an inconsequential decision may have no bearing on their life. By using antonyms like significant, important, consequential, material, and weighty, writers and speakers can convey the true magnitude of a subject matter.