Colossal is a word that is often used to describe something that is immense and enormous in size, strength, or power. However, sometimes using the same word can get boring. In these cases, it can be helpful to have an arsenal of synonyms at your disposal. Some words that could be used instead of colossal include mammoth, gigantic, towering, massive, immense, jumbo, humongous, monstrous, and monumental, among others. Each of these words conveys a sense of size and magnitude that is similar to the word colossal, but they also have unique nuances that can help to add depth and variety to your writing.