Crazily is a common adverb that is often used to describe someone or something that behaves erratically or without logical reasoning. However, there are many other words that can be used as synonyms for crazily. Some of the common synonyms include insanely, wildly, frantically, maniacally, fervently, excitably, and hysterically. Each of these words describe a behavior that is beyond the usual or accepted norm. They are useful to use when describing someone who is acting in an irrational or unexpected way, or when conveying a sense of urgency or intensity in a situation or event. Overall, these synonyms provide the writer with a range of options to choose from when looking to add more descriptive language to their writing.