Gazing open mouthed is an expression used to describe someone who is staring in amazement or shock with their mouth hanging open. There are many synonyms that can be used in place of this phrase to convey a similar meaning. These include staring incredulously, gaping in wonder, gawking in astonishment, gaping in astonishment, staring in disbelief, jaws dropping in disbelief, staring in awe, gaping in amazement, and gasping in surprise. These synonyms can be used interchangeably to describe someone who is in a state of shock or wonder, or who is simply amazed by what they are seeing or hearing.