Pixyish is a descriptive word used to describe someone who is impish, mischievous, or playful. If you're looking for synonyms to use instead of "most pixyish," consider words like mischievous, impish, elfin, playful, sprightly, prankish, whimsical, or puckish. Each of these words has a slightly different connotation, so consider the context and tone of your writing when selecting the best word to use. For example, "mischievous" might be a good choice when describing someone who enjoys causing trouble, while "playful" might be better for someone who just likes to have fun.