"Dumbstricken" is a common adjective used to describe a person who is so shocked or surprised that they are rendered speechless or unable to react. However, there are several synonyms that can be used interchangeably with this word to convey the same or similar meanings. Some of these synonyms include "speechless," "stunned," "flabbergasted," "astonished," "dumbfounded," "aghast," "amazed," "shocked," and "perplexed." Each of these words has its own unique connotation and can be used in different situations, but they all essentially mean the same thing: a person who is struck dumb by an unexpected event or circumstance.