"Grippingly" is an adverb used to describe something that captures and holds the attention of the audience. There are several synonyms that can be used in place of "grippingly" such as riveting, engrossing, captivating, entrancing, mesmerizing, absorbing, immersive, enthralling, spellbinding, and fascinating. Each of these words expresses the same idea of something being captivating and holding one's attention completely. These words can be used to describe various things like a book, movie, speech, story, art, or music that engrosses one's attention and interest. Choose any of these synonyms to express the idea of something that is fascinating or captivating.