The word "boggles" refers to something that causes confusion or astonishment, and there are several synonyms that can be used to convey similar meaning. Some of these synonyms include "bewilder," "flabbergast," "perplex," "astound," "dumbfound," and "amaze." All of these words convey the idea of something being unexpected, surprising, or difficult to comprehend. "Boggles" can also be used to describe a feeling of being overwhelmed or unable to cope with a situation, and in this sense, synonyms could include "overwhelm," "daunt," "intimidate," and "faze." Regardless of the context, these synonyms can be helpful in conveying a sense of surprise, confusion, and astonishment.