Curiosity is an innate human trait that drives us to explore the world around us. Synonyms for the word "in curiosity" include inquisitively, keenly, interestedly, nosily, and eagerly. Using any of these words instead of saying "in curiosity" can add variety to your writing and make it more engaging to readers. For example, instead of saying "He looked at the book in curiosity," you could say "He studied the book inquisitively," or "He examined the book keenly." These synonyms convey a similar meaning to "in curiosity" but with a different tone or emphasis, making your writing more dynamic and expressive.