"Gaped at" is a common phrase used to describe someone who is staring with their mouth open in amazement or shock. However, there are several synonyms available that can be used instead to provide variety and avoid repetition. Some examples include: stared in awe, gawked, looked on with fascination, observed with wonder, ogled, fixed one's gaze, examined with interest, and scrutinized intently. Additionally, if the context allows for it, more specific synonyms such as marveled, flabbergasted, or dumbfounded can be used to further emphasize the depth of surprise or amazement being expressed. Varying word choice can enhance the impact of description and keep writing fresh and engaging.