When it comes to finding synonyms for the word "demonically," there are various options to choose from. For instance, you can use synonyms like fiendishly, devilishly, infernally, wickedly, satanically, and malevolently. Each of these words carries a different connotation and can be used based on the context in which they are applied. For instance, "fiendishly" can be used to describe someone who is extremely cunning or unscrupulous, while "devilishly" can be used to describe someone who is mischievous or naughtily playful. On the other hand, "satanically" can be used to describe something that is evil or wicked. Ultimately, choosing the right synonym for "demonically" can help to convey the intended meaning in a more effective manner.