When someone is taken aback, they are caught off guard and surprised by something unexpected. Synonyms for this phrase include stunned, shocked, bewildered, amazed, flabbergasted, and dumbfounded. All of these words convey a sense of disbelief and astonishment at what has just happened or been revealed. Other expressions that can be used instead of "are taken aback" include "are taken by surprise," "are astonished," and "are gobsmacked." Whatever the situation, these synonyms provide a range of language options for describing the powerful emotions that can arise when we are suddenly and unexpectedly confronted with something new or unexpected.